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| <h1 class="title">SHOW DATABASES</h1> |
| |
| |
| <h3 id="description">Description</h3> |
| |
| <p>Lists the databases that match an optionally supplied regular expression pattern. If no |
| pattern is supplied then the command lists all the databases in the system. |
| Please note that the usage of <code class="language-plaintext highlighter-rouge">SCHEMAS</code> and <code class="language-plaintext highlighter-rouge">DATABASES</code> are interchangeable |
| and mean the same thing.</p> |
| |
| <h3 id="syntax">Syntax</h3> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">SHOW</span> <span class="err">{</span> <span class="n">DATABASES</span> <span class="o">|</span> <span class="n">SCHEMAS</span> <span class="err">}</span> <span class="p">[</span> <span class="k">LIKE</span> <span class="n">regex_pattern</span> <span class="p">]</span> |
| </code></pre></div></div> |
| |
| <h3 id="parameters">Parameters</h3> |
| |
| <ul> |
| <li> |
| <p><strong>regex_pattern</strong></p> |
| |
| <p>Specifies a regular expression pattern that is used to filter the results of the |
| statement.</p> |
| <ul> |
| <li>Except for <code class="language-plaintext highlighter-rouge">*</code> and <code class="language-plaintext highlighter-rouge">|</code> character, the pattern works like a regular expression.</li> |
| <li><code class="language-plaintext highlighter-rouge">*</code> alone matches 0 or more characters and <code class="language-plaintext highlighter-rouge">|</code> is used to separate multiple different regular expressions, |
| any of which can match.</li> |
| <li>The leading and trailing blanks are trimmed in the input pattern before processing. The pattern match is case-insensitive.</li> |
| </ul> |
| </li> |
| </ul> |
| |
| <h3 id="examples">Examples</h3> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- Create database. Assumes a database named `default` already exists in</span> |
| <span class="c1">-- the system. </span> |
| <span class="k">CREATE</span> <span class="k">DATABASE</span> <span class="n">payroll_db</span><span class="p">;</span> |
| <span class="k">CREATE</span> <span class="k">DATABASE</span> <span class="n">payments_db</span><span class="p">;</span> |
| |
| <span class="c1">-- Lists all the databases. </span> |
| <span class="k">SHOW</span> <span class="n">DATABASES</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| <span class="o">|</span><span class="n">databaseName</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| <span class="o">|</span> <span class="k">default</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">payments_db</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">payroll_db</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| |
| <span class="c1">-- Lists databases with name starting with string pattern `pay`</span> |
| <span class="k">SHOW</span> <span class="n">DATABASES</span> <span class="k">LIKE</span> <span class="s1">'pay*'</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| <span class="o">|</span><span class="n">databaseName</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| <span class="o">|</span> <span class="n">payments_db</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">payroll_db</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| |
| <span class="c1">-- Lists all databases. Keywords SCHEMAS and DATABASES are interchangeable. </span> |
| <span class="k">SHOW</span> <span class="n">SCHEMAS</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| <span class="o">|</span><span class="n">databaseName</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| <span class="o">|</span> <span class="k">default</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">payments_db</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">payroll_db</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">------------+</span> |
| </code></pre></div></div> |
| |
| <h3 id="related-statements">Related Statements</h3> |
| |
| <ul> |
| <li><a href="sql-ref-syntax-aux-describe-database.html">DESCRIBE DATABASE</a></li> |
| <li><a href="sql-ref-syntax-ddl-create-database.html">CREATE DATABASE</a></li> |
| <li><a href="sql-ref-syntax-ddl-alter-database.html">ALTER DATABASE</a></li> |
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