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class="vp-page-title"><h1><!---->Table Management</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="Writing Date📅" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="calendar icon" name="calendar"><path d="M716.4 110.137c0-18.753-14.72-33.473-33.472-33.473-18.753 0-33.473 14.72-33.473 33.473v33.473h66.993v-33.473zm-334.87 0c0-18.753-14.72-33.473-33.473-33.473s-33.52 14.72-33.52 33.473v33.473h66.993v-33.473zm468.81 33.52H716.4v100.465c0 18.753-14.72 33.473-33.472 33.473a33.145 33.145 0 01-33.473-33.473V143.657H381.53v100.465c0 18.753-14.72 33.473-33.473 33.473a33.145 33.145 0 01-33.473-33.473V143.657H180.6A134.314 134.314 0 0046.66 277.595v535.756A134.314 134.314 0 00180.6 947.289h669.74a134.36 134.36 0 00133.94-133.938V277.595a134.314 134.314 0 00-133.94-133.938zm33.473 267.877H147.126a33.145 33.145 0 01-33.473-33.473c0-18.752 14.72-33.473 33.473-33.473h736.687c18.752 0 33.472 14.72 33.472 33.473a33.145 33.145 0 01-33.472 33.473z"></path></svg><span data-allow-mismatch="text">1/3/25</span><meta property="datePublished" content="2025-01-03T10:29:25.000Z"></span><!----><span class="page-reading-time-info" aria-label="Reading Time⌛" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon" name="timer"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 5 min</span><meta property="timeRequired" content="PT5M"></span><!----><!----></div><hr></div><!----><div class="" vp-content><!----><div id="markdown-content"><h1 id="table-management" tabindex="-1"><a class="header-anchor" href="#table-management"><span>Table Management</span></a></h1><p>Before starting to use the table management functionality, we recommend familiarizing yourself with the following related background knowledge for a better understanding and application of the table management features:</p><ul><li><a class="route-link" href="/UserGuide/latest-Table/Background-knowledge/Navigating_Time_Series_Data.html">Timeseries Data Model</a>: Understand the basic concepts and characteristics of time series data to establish a foundation for data modeling.</li><li><a class="route-link" href="/UserGuide/latest-Table/Background-knowledge/Data-Model-and-Terminology_apache.html">Modeling Scheme Design</a>: Master the IoTDB time series model and its applicable scenarios to provide a design basis for table management.</li></ul><h2 id="_1-table-management" tabindex="-1"><a class="header-anchor" href="#_1-table-management"><span>1. Table Management</span></a></h2><h3 id="_1-1-create-a-table" tabindex="-1"><a class="header-anchor" href="#_1-1-create-a-table"><span>1.1 Create a Table</span></a></h3><h4 id="_1-1-1-manually-create-a-table-with-create" tabindex="-1"><a class="header-anchor" href="#_1-1-1-manually-create-a-table-with-create"><span>1.1.1 Manually create a table with CREATE</span></a></h4><p>Manually create a table within the current or specified database.The format is "database name. table name".</p><p><strong>Syntax:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">createTableStatement</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">CREATE</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> NOT</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;">)? qualifiedName</span></span> |
| <span class="line"><span style="color:#98C379;"> '('</span><span style="color:#ABB2BF;"> (columnDefinition (</span><span style="color:#98C379;">','</span><span style="color:#ABB2BF;"> columnDefinition)*)? </span><span style="color:#98C379;">')'</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> charsetDesc?</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> comment?</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">WITH</span><span style="color:#ABB2BF;"> properties)?</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> ;</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#ABB2BF;">charsetDesc</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">DEFAULT</span><span style="color:#ABB2BF;">? (</span><span style="color:#C678DD;">CHAR</span><span style="color:#C678DD;"> SET</span><span style="color:#ABB2BF;"> | CHARSET | </span><span style="color:#C678DD;">CHARACTER</span><span style="color:#C678DD;"> SET</span><span style="color:#ABB2BF;">) EQ? identifierOrString</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> ;</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#ABB2BF;">columnDefinition</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> : identifier columnCategory</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">(TAG | ATTRIBUTE | </span><span style="color:#C678DD;">TIME</span><span style="color:#ABB2BF;">) charsetName? comment?</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> | identifier </span><span style="color:#C678DD;">type</span><span style="color:#ABB2BF;"> (columnCategory</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">(TAG | ATTRIBUTE | </span><span style="color:#C678DD;">TIME</span><span style="color:#ABB2BF;"> | FIELD))? charsetName? comment?</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> ;</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#ABB2BF;">charsetName</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> : </span><span style="color:#C678DD;">CHAR</span><span style="color:#C678DD;"> SET</span><span style="color:#ABB2BF;"> identifier</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> | CHARSET identifier</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> | </span><span style="color:#C678DD;">CHARACTER</span><span style="color:#C678DD;"> SET</span><span style="color:#ABB2BF;"> identifier</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> ;</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#ABB2BF;">comment</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> : COMMENT string</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> ;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>Note:</strong></p><ol><li><p>When creating a table, you do not need to specify a time column. IoTDB automatically adds a column named "time" and places it as the first column. All other columns can be added by enabling the <code>enable_auto_create_schema</code> option in the database configuration, or through the session interface for automatic creation or by using table modification statements.</p></li><li><p>Since version V2.0.8, tables support custom naming of the time column during creation. The order of the custom time column in the table is determined by the order in the creation SQL. The related constraints are as follows:</p><ul><li>When the column category is set to TIME, the data type must be TIMESTAMP.</li><li>Each table allows at most one time column (columnCategory = TIME).</li><li>If no time column is explicitly defined, no other column can use "time" as its name to avoid conflicts with the system's default time column naming.</li></ul></li><li><p>The column category can be omitted and defaults to FIELD. When the column category is TAG or ATTRIBUTE, the data type must be STRING (can be omitted).</p></li><li><p>The TTL of a table defaults to the TTL of its database. If the default value is used, this attribute can be omitted or set to default.</p></li><li><p><TABLE_NAME> table name has the following characteristics:</p><ul><li><p>It is case-insensitive and, upon successful creation, is uniformly displayed in lowercase.</p></li><li><p>The name can include special characters, such as <code>~!</code>"%`, etc.</p></li><li><p>Table names containing special characters or Chinese characters must be enclosed in double quotation marks ("") during creation.</p><ul><li>Note: In SQL, special characters or Chinese table names must be enclosed in double quotes. In the native API, no additional quotes are needed; otherwise, the table name will include the quote characters.</li></ul></li><li><p>When naming a table, the outermost double quotation marks (<code>""</code>) will not appear in the actual table name.</p></li><li><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#7F848E;font-style:italic;"> -- In SQL</span></span> |
| <span class="line"><span style="color:#98C379;"> "a""b"</span><span style="color:#7F848E;font-style:italic;"> --> a"b</span></span> |
| <span class="line"><span style="color:#98C379;"> """"""</span><span style="color:#7F848E;font-style:italic;"> --> ""</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> -- In API</span></span> |
| <span class="line"><span style="color:#98C379;"> "a""b"</span><span style="color:#7F848E;font-style:italic;"> --> "a""b"</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div></li></ul></li><li><p>columnDefinition column names have the same characteristics as table names and can include the special character <code>.</code>.</p></li><li><p>COMMENT adds a comment to the table.</p></li></ol><p><strong>Examples:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">CREATE</span><span style="color:#C678DD;"> TABLE</span><span style="color:#61AFEF;"> table1</span><span style="color:#ABB2BF;"> (</span></span> |
| <span class="line"><span style="color:#C678DD;"> time</span><span style="color:#C678DD;"> TIMESTAMP</span><span style="color:#C678DD;"> TIME</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> region STRING TAG,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> plant_id STRING TAG,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> device_id STRING TAG,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> model_id STRING ATTRIBUTE,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> maintenance STRING ATTRIBUTE COMMENT </span><span style="color:#98C379;">'maintenance'</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> temperature </span><span style="color:#C678DD;">FLOAT</span><span style="color:#ABB2BF;"> FIELD COMMENT </span><span style="color:#98C379;">'temperature'</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> humidity </span><span style="color:#C678DD;">FLOAT</span><span style="color:#ABB2BF;"> FIELD COMMENT </span><span style="color:#98C379;">'humidity'</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#C678DD;"> status</span><span style="color:#C678DD;"> Boolean</span><span style="color:#ABB2BF;"> FIELD COMMENT </span><span style="color:#98C379;">'status'</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> arrival_time </span><span style="color:#C678DD;">TIMESTAMP</span><span style="color:#ABB2BF;"> FIELD COMMENT </span><span style="color:#98C379;">'arrival_time'</span></span> |
| <span class="line"><span style="color:#ABB2BF;">) COMMENT </span><span style="color:#98C379;">'table1'</span><span style="color:#C678DD;"> WITH</span><span style="color:#ABB2BF;"> (TTL</span><span style="color:#56B6C2;">=</span><span style="color:#D19A66;">31536000000</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">CREATE</span><span style="color:#C678DD;"> TABLE</span><span style="color:#61AFEF;"> if</span><span style="color:#C678DD;"> not</span><span style="color:#C678DD;"> exists</span><span style="color:#ABB2BF;"> tableB ();</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">CREATE</span><span style="color:#C678DD;"> TABLE</span><span style="color:#61AFEF;"> tableC</span><span style="color:#ABB2BF;"> (</span></span> |
| <span class="line"><span style="color:#98C379;"> "Site"</span><span style="color:#ABB2BF;"> STRING TAG,</span></span> |
| <span class="line"><span style="color:#98C379;"> "Temperature"</span><span style="color:#ABB2BF;"> int32 FIELD COMMENT </span><span style="color:#98C379;">'temperature'</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> ) </span><span style="color:#C678DD;">with</span><span style="color:#ABB2BF;"> (TTL</span><span style="color:#56B6C2;">=</span><span style="color:#C678DD;">DEFAULT</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> </span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> -- Custom time column: named time_test, located in the second column of the table.</span></span> |
| <span class="line"><span style="color:#C678DD;"> CREATE</span><span style="color:#C678DD;"> TABLE</span><span style="color:#61AFEF;"> table1</span><span style="color:#ABB2BF;"> (</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> region STRING TAG, </span></span> |
| <span class="line"><span style="color:#ABB2BF;"> time_user_defined </span><span style="color:#C678DD;">TIMESTAMP</span><span style="color:#C678DD;"> TIME</span><span style="color:#ABB2BF;">, </span></span> |
| <span class="line"><span style="color:#ABB2BF;"> temperature </span><span style="color:#C678DD;">FLOAT</span><span style="color:#ABB2BF;"> FIELD</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> );</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Note: If your terminal does not support multi-line paste (e.g., Windows CMD), please reformat the SQL statement into a single line before execution.</p><h3 id="_1-2-view-tables" tabindex="-1"><a class="header-anchor" href="#_1-2-view-tables"><span>1.2 View Tables</span></a></h3><p>Used to view all tables and their properties in the current or a specified database.</p><p><strong>Syntax:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">SHOW TABLES (DETAILS)? ((</span><span style="color:#C678DD;">FROM</span><span style="color:#ABB2BF;"> | </span><span style="color:#C678DD;">IN</span><span style="color:#ABB2BF;">) </span><span style="color:#C678DD;">database_name</span><span style="color:#ABB2BF;">)?</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p><strong>Note:</strong></p><ol><li>If the <code>FROM</code> or <code>IN</code> clause is specified, the command lists all tables in the specified database.</li><li>If neither <code>FROM</code> nor <code>IN</code> is specified, the command lists all tables in the currently selected database. If no database is selected (<code>USE</code> statement not executed), an error is returned.</li><li>When the <code>DETAILS</code> option is used, the command shows the current state of each table: <ol><li><code>USING</code>: The table is available and operational.</li><li><code>PRE_CREATE</code>: The table is in the process of being created or the creation has failed; the table is not available.</li><li><code>PRE_DELETE</code>: The table is in the process of being deleted or the deletion has failed; the table will remain permanently unavailable.</li></ol></li></ol><p><strong>Examples:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">show tables </span><span style="color:#C678DD;">from</span><span style="color:#ABB2BF;"> database1;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-shell"><span class="line"><span style="color:#61AFEF;">+---------+---------------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">TableName</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TTL(ms</span><span style="color:#ABB2BF;">)|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+---------+---------------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">table1</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">31536000000</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+---------+---------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">show tables details </span><span style="color:#C678DD;">from</span><span style="color:#ABB2BF;"> database1;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-shell"><span class="line"><span style="color:#61AFEF;">+---------------+-----------+------+-------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TableName</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TTL(ms</span><span style="color:#ABB2BF;">)|</span><span style="color:#61AFEF;">Status</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">Comment</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+---------------+-----------+------+-------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">table1</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">31536000000</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">table1</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+---------------+-----------+------+-------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_1-3-view-table-columns" tabindex="-1"><a class="header-anchor" href="#_1-3-view-table-columns"><span>1.3 View Table Columns</span></a></h3><p>Used to view column names, data types, categories, and states of a table.</p><p><strong>Syntax:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">DESC</span><span style="color:#ABB2BF;"> | DESCRIBE) </span><span style="color:#56B6C2;"><</span><span style="color:#ABB2BF;">TABLE_NAME</span><span style="color:#56B6C2;">></span><span style="color:#ABB2BF;"> (DETAILS)?</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p><strong>Note:</strong> If the <code>DETAILS</code> option is specified, detailed state information of the columns is displayed:</p><ul><li><code>USING</code>: The column is in normal use.</li><li><code>PRE_DELETE</code>: The column is being deleted or the deletion has failed; it is permanently unavailable.</li></ul><p><strong>Examples:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">desc</span><span style="color:#ABB2BF;"> table1;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-shell"><span class="line"><span style="color:#61AFEF;">+------------+---------+---------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">ColumnName</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">DataType</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">Category</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+------------+---------+---------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| time|</span><span style="color:#61AFEF;">TIMESTAMP</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TIME</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">region</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TAG</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">plant_id</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TAG</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">device_id</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TAG</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">model_id</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">ATTRIBUTE</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">maintenance</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">ATTRIBUTE</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">temperature</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FLOAT</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">humidity</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FLOAT</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">status</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">BOOLEAN</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">arrival_time</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">TIMESTAMP</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+------------+---------+---------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">desc</span><span style="color:#ABB2BF;"> table1 details;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-shell"><span class="line"><span style="color:#61AFEF;">+------------+---------+---------+------+------------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">ColumnName</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">DataType</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">Category</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">Status</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">Comment</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+------------+---------+---------+------+------------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| time|</span><span style="color:#61AFEF;">TIMESTAMP</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TIME</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">null</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">region</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TAG</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">null</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">plant_id</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TAG</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">null</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">device_id</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">TAG</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">null</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">model_id</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">ATTRIBUTE</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">null</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">maintenance</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">STRING</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">ATTRIBUTE</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">maintenance</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">temperature</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FLOAT</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">temperature</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">humidity</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FLOAT</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">humidity</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">status</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">BOOLEAN</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">status</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">arrival_time</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">TIMESTAMP</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">FIELD</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">USING</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">arrival_time</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+------------+---------+---------+------+------------+</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_1-4-view-table-creation-statement" tabindex="-1"><a class="header-anchor" href="#_1-4-view-table-creation-statement"><span>1.4 View Table Creation Statement</span></a></h3><p>Retrieves the complete definition statement of a table or view under the table model. This feature automatically fills in all default values that were omitted during creation, so the displayed statement may differ from the original CREATE statement.</p><blockquote><p>This feature is supported starting from v2.0.5.</p></blockquote><p><strong>Syntax:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">SHOW </span><span style="color:#C678DD;">CREATE</span><span style="color:#C678DD;"> TABLE</span><span style="color:#56B6C2;"> <</span><span style="color:#ABB2BF;">TABLE_NAME</span><span style="color:#56B6C2;">></span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p><strong>Note:：</strong></p><ol><li>This statement does not support queries on system tables.</li></ol><p><strong>Example:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">show </span><span style="color:#C678DD;">create</span><span style="color:#C678DD;"> table</span><span style="color:#ABB2BF;"> table1;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-shell"><span class="line"><span style="color:#61AFEF;">+------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">Table</span><span style="color:#ABB2BF;">| </span><span style="color:#61AFEF;">Create</span><span style="color:#98C379;"> Table</span><span style="color:#ABB2BF;">|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+</span></span> |
| <span class="line"><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">table1</span><span style="color:#ABB2BF;">|</span><span style="color:#61AFEF;">CREATE</span><span style="color:#98C379;"> TABLE</span><span style="color:#98C379;"> "table1"</span><span style="color:#ABB2BF;"> (</span><span style="color:#98C379;">"region"</span><span style="color:#98C379;"> STRING</span><span style="color:#98C379;"> TAG,"plant_id"</span><span style="color:#98C379;"> STRING</span><span style="color:#98C379;"> TAG,"device_id"</span><span style="color:#98C379;"> STRING</span><span style="color:#98C379;"> TAG,"model_id"</span><span style="color:#98C379;"> STRING</span><span style="color:#98C379;"> ATTRIBUTE,"maintenance"</span><span style="color:#98C379;"> STRING</span><span style="color:#98C379;"> ATTRIBUTE,"temperature"</span><span style="color:#98C379;"> FLOAT</span><span style="color:#98C379;"> FIELD,"humidity"</span><span style="color:#98C379;"> FLOAT</span><span style="color:#98C379;"> FIELD,"status"</span><span style="color:#98C379;"> BOOLEAN</span><span style="color:#98C379;"> FIELD,"arrival_time"</span><span style="color:#98C379;"> TIMESTAMP</span><span style="color:#98C379;"> FIELD</span><span style="color:#ABB2BF;">) WITH (</span><span style="color:#E06C75;">ttl</span><span style="color:#56B6C2;">=</span><span style="color:#98C379;">31536000000</span><span style="color:#ABB2BF;">)|</span></span> |
| <span class="line"><span style="color:#61AFEF;">+------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+</span></span> |
| <span class="line"><span style="color:#61AFEF;">Total</span><span style="color:#98C379;"> line</span><span style="color:#98C379;"> number</span><span style="color:#98C379;"> =</span><span style="color:#D19A66;"> 1</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_1-5-update-tables" tabindex="-1"><a class="header-anchor" href="#_1-5-update-tables"><span>1.5 Update Tables</span></a></h3><p>Used to update a table, including adding or deleting columns and configuring table properties.</p><p><strong>Syntax:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#ABB2BF;">#addColumn;</span></span> |
| <span class="line"><span style="color:#C678DD;">ALTER</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;">)? tableName</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">qualifiedName </span><span style="color:#C678DD;">ADD</span><span style="color:#ABB2BF;"> COLUMN (</span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> NOT</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;">)? column</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">columnDefinition; </span></span> |
| <span class="line"><span style="color:#ABB2BF;">#dropColumn; </span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">ALTER</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;">)? tableName</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">qualifiedName </span><span style="color:#C678DD;">DROP</span><span style="color:#ABB2BF;"> COLUMN (</span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;">)? column</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">identifier;</span></span> |
| <span class="line"><span style="color:#ABB2BF;">#setTableProperties; </span></span> |
| <span class="line"><span style="color:#ABB2BF;">// </span><span style="color:#C678DD;">set</span><span style="color:#ABB2BF;"> TTL can </span><span style="color:#C678DD;">use</span><span style="color:#ABB2BF;"> this;</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| </span><span style="color:#C678DD;">ALTER</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;">)? tableName</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">qualifiedName </span><span style="color:#C678DD;">SET</span><span style="color:#ABB2BF;"> PROPERTIES propertyAssignments; </span></span> |
| <span class="line"><span style="color:#ABB2BF;">| COMMENT </span><span style="color:#C678DD;">ON</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> tableName</span><span style="color:#56B6C2;">=</span><span style="color:#ABB2BF;">qualifiedName </span><span style="color:#C678DD;">IS</span><span style="color:#98C379;"> 'table_comment'</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#ABB2BF;">| COMMENT </span><span style="color:#C678DD;">ON</span><span style="color:#ABB2BF;"> COLUMN </span><span style="color:#D19A66;">tableName</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">column</span><span style="color:#C678DD;"> IS</span><span style="color:#98C379;"> 'column_comment'</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><strong>Note:：</strong></p><ol><li>The <code>SET PROPERTIES</code> operation currently only supports configuring the <code>TTL</code> property of a table</li><li>The delete column function only supports deleting the ATTRIBUTE and FILD columns, and the TAG column does not support deletion.</li><li>The modified comment will overwrite the original comment. If null is specified, the previous comment will be erased.</li></ol><p><strong>Example:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">ALTER</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> table1 </span><span style="color:#C678DD;">ADD</span><span style="color:#ABB2BF;"> COLUMN </span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> NOT</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;"> a TAG COMMENT </span><span style="color:#98C379;">'a'</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;">ALTER</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> table1 </span><span style="color:#C678DD;">ADD</span><span style="color:#ABB2BF;"> COLUMN </span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> NOT</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;"> b </span><span style="color:#C678DD;">FLOAT</span><span style="color:#ABB2BF;"> FIELD COMMENT </span><span style="color:#98C379;">'b'</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;">ALTER</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> table1 </span><span style="color:#C678DD;">set</span><span style="color:#ABB2BF;"> properties TTL</span><span style="color:#56B6C2;">=</span><span style="color:#D19A66;">3600</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;">COMMENT ON TABLE </span><span style="color:#ABB2BF;">table1 </span><span style="color:#C678DD;">IS</span><span style="color:#98C379;"> 'table1'</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;">COMMENT ON COLUMN </span><span style="color:#D19A66;">table1</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">a</span><span style="color:#C678DD;"> IS</span><span style="color:#C678DD;"> null</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_1-6-delete-tables" tabindex="-1"><a class="header-anchor" href="#_1-6-delete-tables"><span>1.6 Delete Tables</span></a></h3><p>Used to delete a table.</p><p><strong>Syntax:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">DROP</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">IF</span><span style="color:#C678DD;"> EXISTS</span><span style="color:#ABB2BF;">)? </span><span style="color:#56B6C2;"><</span><span style="color:#ABB2BF;">TABLE_NAME</span><span style="color:#56B6C2;">></span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p><strong>Examples:</strong></p><div class="language-sql line-numbers-mode" data-highlighter="shiki" data-ext="sql" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sql"><span class="line"><span style="color:#C678DD;">DROP</span><span style="color:#C678DD;"> TABLE</span><span style="color:#ABB2BF;"> table1;</span></span> |
| <span class="line"><span style="color:#C678DD;">DROP</span><span style="color:#C678DD;"> TABLE</span><span style="color:#D19A66;"> database1</span><span style="color:#ABB2BF;">.</span><span style="color:#D19A66;">table1</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div></div></div></div><!----><!----><!----></div><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a class="auto-link external-link vp-meta-label" href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/latest-Table/Basic-Concept/Table-Management_apache.md" aria-label="Found Error? Edit this page on GitHub" rel="noopener noreferrer" target="_blank"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon" name="edit"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->Found Error? Edit this page on GitHub<!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">Last Updated: </span><time class="vp-meta-info" datetime="2026-03-31T09:09:10.000Z" data-allow-mismatch>3/31/26, 9:09 AM</time></div><!----></div></footer><nav class="vp-page-nav"><a class="route-link auto-link prev" href="/UserGuide/latest-Table/Basic-Concept/Database-Management_apache.html" aria-label="Database Management"><div class="hint"><span class="arrow start"></span>Prev</div><div class="link"><!---->Database Management</div></a><a class="route-link auto-link next" href="/UserGuide/latest-Table/Basic-Concept/Write-Updata-Data_apache.html" aria-label="Write&Updata Data"><div class="hint">Next<span class="arrow end"></span></div><div class="link">Write&Updata Data<!----></div></a></nav><!----><!----><!--]--></main><!--]--><footer class="site-footer"><span id="doc-version" style="display:none;">latest-Table</span><p class="copyright-text">Copyright © 2026 The Apache Software Foundation. |
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