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<h1><span class="section-number">7.3.21. </span><code class="docutils literal notranslate"><span class="pre">delete</span></code><a class="headerlink" href="#delete" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.3.21.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">delete</span></code> command deletes specified record of table.</p>
<div class="section" id="cascade-delete">
<span id="id1"></span><h3><span class="section-number">7.3.21.1.1. </span>Cascade delete<a class="headerlink" href="#cascade-delete" title="Permalink to this headline">¶</a></h3>
<p>There is a case that multiple table is associated. For example, the key of one table are referenced by other table’s records. In such a case, if you delete the key of one table, other table’s records are also removed.</p>
<p>Note that the type of other table’s column is COLUMN_VECTOR, only the value of referencing key is removed from the vector value.</p>
</div>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.3.21.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>delete table [key [id [filter]]]
</pre></div>
</div>
</div>
<div class="section" id="usage">
<h2><span class="section-number">7.3.21.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Here are a schema definition and sample data to show usage.</p>
<p>Delete the record from Entry table which has “2” as the key.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>delete Entry 2
# [[0, 1337566253.89858, 0.000355720520019531], true]
select Entry
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 1
# ],
# [
# [
# "_id",
# "UInt32"
# ],
# [
# "_key",
# "UInt32"
# ],
# [
# "status",
# "ShortText"
# ]
# ],
# [
# 1,
# 1,
# "OK"
# ]
# ]
# ]
# ]
</pre></div>
</div>
<p>Here is the example about cascaded delete.</p>
<p>The country column of Users table associates with Country table.</p>
<p>“Cascaded delete” removes the records which matches specified key and refers that key.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Country TABLE_HASH_KEY ShortText
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_create Users TABLE_HASH_KEY UInt32
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Users name COLUMN_SCALAR ShortText
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Users country COLUMN_SCALAR Country
# [[0, 1337566253.89858, 0.000355720520019531], true]
load --table Users
[
{"_key": 1, "name": "John", country: "United States"}
{"_key": 2, "name": "Mike", country: "United States"}
{"_key": 3, "name": "Takashi", country: "Japan"}
{"_key": 4, "name": "Hanako", country: "Japan"}
]
# [[0, 1337566253.89858, 0.000355720520019531], 4]
load --table Country
[
{"_key": "United States"}
{"_key": "Japan"}
]
# [[0, 1337566253.89858, 0.000355720520019531], 2]
delete Country "United States"
# [[0, 1337566253.89858, 0.000355720520019531], true]
select Country
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 1
# ],
# [
# [
# "_id",
# "UInt32"
# ],
# [
# "_key",
# "ShortText"
# ]
# ],
# [
# 2,
# "Japan"
# ]
# ]
# ]
# ]
select Users
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 4
# ],
# [
# [
# "_id",
# "UInt32"
# ],
# [
# "_key",
# "UInt32"
# ],
# [
# "country",
# "Country"
# ],
# [
# "name",
# "ShortText"
# ]
# ],
# [
# 1,
# 1,
# "",
# "John"
# ],
# [
# 2,
# 2,
# "",
# "Mike"
# ],
# [
# 3,
# 3,
# "Japan",
# "Takashi"
# ],
# [
# 4,
# 4,
# "Japan",
# "Hanako"
# ]
# ]
# ]
# ]
</pre></div>
</div>
</div>
<div class="section" id="parameters">
<h2><span class="section-number">7.3.21.4. </span>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">table</span></code></p>
<blockquote>
<div><p>Specifies the name of table to delete the records.</p>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">key</span></code></p>
<blockquote>
<div><p>Specifies the key of record to delete. If you use the table with TABLE_NO_KEY, the key is just ignored.
(Use <code class="docutils literal notranslate"><span class="pre">id</span></code> parameter in such a case)</p>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">id</span></code></p>
<blockquote>
<div><p>Specifies the id of record to delete. If you specify <code class="docutils literal notranslate"><span class="pre">id</span></code> parameter, you must not specify <code class="docutils literal notranslate"><span class="pre">key</span></code> parameter.</p>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">filter</span></code></p>
<blockquote>
<div><p>Specifies the expression of grn_expr to identify the record. If you specify <code class="docutils literal notranslate"><span class="pre">filter</span></code> parameter,
you must not specify <code class="docutils literal notranslate"><span class="pre">key</span></code> and <code class="docutils literal notranslate"><span class="pre">id</span></code> parameter.</p>
</div></blockquote>
</div>
<div class="section" id="return-value">
<h2><span class="section-number">7.3.21.5. </span>Return value<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>[HEADER, SUCCEEDED_OR_NOT]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">HEADER</span></code></p>
<blockquote>
<div><p>See <a class="reference internal" href="../command/output_format.html"><span class="doc">Output format</span></a> about <code class="docutils literal notranslate"><span class="pre">HEADER</span></code>.</p>
</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">SUCCEEDED_OR_NOT</span></code></p>
<blockquote>
<div><p>If command succeeded, it returns true, otherwise it returns false on error.</p>
</div></blockquote>
</div>
<div class="section" id="see-also">
<h2><span class="section-number">7.3.21.6. </span>See also<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
<p><a class="reference internal" href="load.html"><span class="doc">load</span></a></p>
</div>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.3.21. <code class="docutils literal notranslate"><span class="pre">delete</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.3.21.1. Summary</a><ul>
<li><a class="reference internal" href="#cascade-delete">7.3.21.1.1. Cascade delete</a></li>
</ul>
</li>
<li><a class="reference internal" href="#syntax">7.3.21.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.3.21.3. Usage</a></li>
<li><a class="reference internal" href="#parameters">7.3.21.4. Parameters</a></li>
<li><a class="reference internal" href="#return-value">7.3.21.5. Return value</a></li>
<li><a class="reference internal" href="#see-also">7.3.21.6. See also</a></li>
</ul>
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title="next chapter"><span class="section-number">7.3.22. </span><code class="docutils literal notranslate"><span class="pre">dump</span></code></a></p>
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