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<h1 class="title">LOAD DATA</h1>
<h3 id="description">Description</h3>
<p><code class="highlighter-rouge">LOAD DATA</code> statement loads the data into a Hive serde table from the user specified directory or file. If a directory is specified then all the files from the directory are loaded. If a file is specified then only the single file is loaded. Additionally the <code class="highlighter-rouge">LOAD DATA</code> statement takes an optional partition specification. When a partition is specified, the data files (when input source is a directory) or the single file (when input source is a file) are loaded into the partition of the target table.</p>
<h3 id="syntax">Syntax</h3>
<div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">LOAD</span> <span class="k">DATA</span> <span class="p">[</span> <span class="k">LOCAL</span> <span class="p">]</span> <span class="n">INPATH</span> <span class="n">path</span> <span class="p">[</span> <span class="n">OVERWRITE</span> <span class="p">]</span> <span class="k">INTO</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="p">[</span> <span class="n">partition_spec</span> <span class="p">]</span>
</code></pre></div></div>
<h3 id="parameters">Parameters</h3>
<ul>
<li>
<p><strong>path</strong></p>
<p>Path of the file system. It can be either an absolute or a relative path.</p>
</li>
<li>
<p><strong>table_identifier</strong></p>
<p>Specifies a table name, which may be optionally qualified with a database name.</p>
<p><strong>Syntax:</strong> <code class="highlighter-rouge">[ database_name. ] table_name</code></p>
</li>
<li>
<p><strong>partition_spec</strong></p>
<p>An optional parameter that specifies a comma separated list of key and value pairs
for partitions.</p>
<p><strong>Syntax:</strong> <code class="highlighter-rouge">PARTITION ( partition_col_name = partition_col_val [ , ... ] )</code></p>
</li>
<li>
<p><strong>LOCAL</strong></p>
<p>If specified, it causes the <code class="highlighter-rouge">INPATH</code> to be resolved against the local file system, instead of the default file system, which is typically a distributed storage.</p>
</li>
<li>
<p><strong>OVERWRITE</strong></p>
<p>By default, new data is appended to the table. If <code class="highlighter-rouge">OVERWRITE</code> is used, the table is instead overwritten with new data.</p>
</li>
</ul>
<h3 id="examples">Examples</h3>
<div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- Example without partition specification.</span>
<span class="c1">-- Assuming the students table has already been created and populated.</span>
<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">students</span><span class="p">;</span>
<span class="o">+</span><span class="c1">---------+----------------------+----------+</span>
<span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">address</span><span class="o">|</span><span class="n">student_id</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---------+----------------------+----------+</span>
<span class="o">|</span><span class="n">Amy</span> <span class="n">Smith</span><span class="o">|</span><span class="mi">123</span> <span class="n">Park</span> <span class="n">Ave</span><span class="p">,</span> <span class="n">San</span> <span class="n">Jose</span><span class="o">|</span> <span class="mi">111111</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---------+----------------------+----------+</span>
<span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">test_load</span> <span class="p">(</span><span class="n">name</span> <span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">64</span><span class="p">),</span> <span class="n">address</span> <span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">64</span><span class="p">),</span> <span class="n">student_id</span> <span class="nb">INT</span><span class="p">)</span> <span class="k">USING</span> <span class="n">HIVE</span><span class="p">;</span>
<span class="c1">-- Assuming the students table is in '/user/hive/warehouse/'</span>
<span class="k">LOAD</span> <span class="k">DATA</span> <span class="k">LOCAL</span> <span class="n">INPATH</span> <span class="s1">'/user/hive/warehouse/students'</span> <span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="k">TABLE</span> <span class="n">test_load</span><span class="p">;</span>
<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">test_load</span><span class="p">;</span>
<span class="o">+</span><span class="c1">---------+----------------------+----------+</span>
<span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">address</span><span class="o">|</span><span class="n">student_id</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---------+----------------------+----------+</span>
<span class="o">|</span><span class="n">Amy</span> <span class="n">Smith</span><span class="o">|</span><span class="mi">123</span> <span class="n">Park</span> <span class="n">Ave</span><span class="p">,</span> <span class="n">San</span> <span class="n">Jose</span><span class="o">|</span> <span class="mi">111111</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---------+----------------------+----------+</span>
<span class="c1">-- Example with partition specification.</span>
<span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">test_partition</span> <span class="p">(</span><span class="n">c1</span> <span class="nb">INT</span><span class="p">,</span> <span class="n">c2</span> <span class="nb">INT</span><span class="p">,</span> <span class="n">c3</span> <span class="nb">INT</span><span class="p">)</span> <span class="n">PARTITIONED</span> <span class="k">BY</span> <span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c3</span><span class="p">);</span>
<span class="k">INSERT</span> <span class="k">INTO</span> <span class="n">test_partition</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">c2</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span> <span class="n">c3</span> <span class="o">=</span> <span class="mi">3</span><span class="p">)</span> <span class="k">VALUES</span> <span class="p">(</span><span class="mi">1</span><span class="p">);</span>
<span class="k">INSERT</span> <span class="k">INTO</span> <span class="n">test_partition</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">c2</span> <span class="o">=</span> <span class="mi">5</span><span class="p">,</span> <span class="n">c3</span> <span class="o">=</span> <span class="mi">6</span><span class="p">)</span> <span class="k">VALUES</span> <span class="p">(</span><span class="mi">4</span><span class="p">);</span>
<span class="k">INSERT</span> <span class="k">INTO</span> <span class="n">test_partition</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">c2</span> <span class="o">=</span> <span class="mi">8</span><span class="p">,</span> <span class="n">c3</span> <span class="o">=</span> <span class="mi">9</span><span class="p">)</span> <span class="k">VALUES</span> <span class="p">(</span><span class="mi">7</span><span class="p">);</span>
<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">test_partition</span><span class="p">;</span>
<span class="o">+</span><span class="c1">---+---+---+</span>
<span class="o">|</span> <span class="n">c1</span><span class="o">|</span> <span class="n">c2</span><span class="o">|</span> <span class="n">c3</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---+---+---+</span>
<span class="o">|</span> <span class="mi">1</span><span class="o">|</span> <span class="mi">2</span><span class="o">|</span> <span class="mi">3</span><span class="o">|</span>
<span class="o">|</span> <span class="mi">4</span><span class="o">|</span> <span class="mi">5</span><span class="o">|</span> <span class="mi">6</span><span class="o">|</span>
<span class="o">|</span> <span class="mi">7</span><span class="o">|</span> <span class="mi">8</span><span class="o">|</span> <span class="mi">9</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---+---+---+</span>
<span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">test_load_partition</span> <span class="p">(</span><span class="n">c1</span> <span class="nb">INT</span><span class="p">,</span> <span class="n">c2</span> <span class="nb">INT</span><span class="p">,</span> <span class="n">c3</span> <span class="nb">INT</span><span class="p">)</span> <span class="k">USING</span> <span class="n">HIVE</span> <span class="n">PARTITIONED</span> <span class="k">BY</span> <span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c3</span><span class="p">);</span>
<span class="c1">-- Assuming the test_partition table is in '/user/hive/warehouse/'</span>
<span class="k">LOAD</span> <span class="k">DATA</span> <span class="k">LOCAL</span> <span class="n">INPATH</span> <span class="s1">'/user/hive/warehouse/test_partition/c2=2/c3=3'</span>
<span class="n">OVERWRITE</span> <span class="k">INTO</span> <span class="k">TABLE</span> <span class="n">test_load_partition</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">c2</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">c3</span><span class="o">=</span><span class="mi">3</span><span class="p">);</span>
<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">test_load_partition</span><span class="p">;</span>
<span class="o">+</span><span class="c1">---+---+---+</span>
<span class="o">|</span> <span class="n">c1</span><span class="o">|</span> <span class="n">c2</span><span class="o">|</span> <span class="n">c3</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---+---+---+</span>
<span class="o">|</span> <span class="mi">1</span><span class="o">|</span> <span class="mi">2</span><span class="o">|</span> <span class="mi">3</span><span class="o">|</span>
<span class="o">+</span><span class="c1">---+---+---+</span>
</code></pre></div></div>
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