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Su, Xiaomeng
76a5b1ee83
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com> Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
63 lines
6.5 KiB
HTML
63 lines
6.5 KiB
HTML
<a name="dli_08_0263"></a><a name="dli_08_0263"></a>
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<h1 class="topictitle1">Adding a Column</h1>
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<div id="body1582699449043"><div class="section" id="dli_08_0263__en-us_topic_0156816309_en-us_topic_0093946741_s86887e0a86644c22b61a4c2ccc84025e"><h4 class="sectiontitle">Function</h4><p id="dli_08_0263__en-us_topic_0156816309_en-us_topic_0093946741_a9755a68b9d0d47668ac554151d03e0ce">This statement is used to add one or more new columns to a table.</p>
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</div>
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<div class="section" id="dli_08_0263__en-us_topic_0156816309_en-us_topic_0093946741_sd6725bae42f0429e8bc6dfa2e92b9664"><h4 class="sectiontitle">Syntax</h4><div class="codecoloring" codetype="Sql" id="dli_08_0263__en-us_topic_0156816309_screen16901195231215"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="p">[</span><span class="n">db_name</span><span class="p">.]</span><span class="k">table_name</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="n">COLUMNS</span><span class="w"> </span><span class="p">(</span><span class="n">col_name1</span><span class="w"> </span><span class="n">col_type1</span><span class="w"> </span><span class="p">[</span><span class="k">COMMENT</span><span class="w"> </span><span class="n">col_comment1</span><span class="p">],</span><span class="w"> </span><span class="p">...);</span>
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</pre></div></td></tr></table></div>
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</div>
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</div>
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<div class="section" id="dli_08_0263__en-us_topic_0114776199_en-us_topic_0107972084_en-us_topic_0093946811_s85a6f8f752b14c12908d2303d618d510"><h4 class="sectiontitle">Keywords</h4><ul id="dli_08_0263__en-us_topic_0114776199_en-us_topic_0107972084_en-us_topic_0093946811_u6276390c1d994411a3ade99c0da8c0c0"><li id="dli_08_0263__en-us_topic_0114776199_en-us_topic_0107972084_en-us_topic_0093946811_lf20ccaa3b133495591e692c43a7287d9">ADD COLUMNS: columns to add</li><li id="dli_08_0263__en-us_topic_0114776199_en-us_topic_0107972084_en-us_topic_0093946811_lae91afc5a5e84024951de4cb76ee67c9">COMMENT: column description</li></ul>
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</div>
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<div class="section" id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0093946905_s95436b2cebbc4c34b0e6ca8427d4f1d9"><h4 class="sectiontitle">Parameters</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0103084433_t2fa8597e0dde4884bd6412ac207ebea8" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameters</caption><thead align="left"><tr id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0103084433_r16c75fd8fdbf41c79f9aee82b032351c"><th align="left" class="cellrowborder" valign="top" width="16.23%" id="mcps1.3.4.2.2.3.1.1"><p id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0103084433_a9dd69379a3f54904a9c510fb817659ad">Parameter</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="83.77%" id="mcps1.3.4.2.2.3.1.2"><p id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0103084433_a7ede0d62539542baa7e367cf902bf2b2">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0103084433_r8ab7399810eb42b7abf51ae705c6cf83"><td class="cellrowborder" valign="top" width="16.23%" headers="mcps1.3.4.2.2.3.1.1 "><p id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0103084433_a1cdeda4790a8452d8619c797147bf9cf">db_name</p>
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</td>
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<td class="cellrowborder" valign="top" width="83.77%" headers="mcps1.3.4.2.2.3.1.2 "><p id="dli_08_0263__en-us_topic_0114776188_en-us_topic_0103084433_p4729195274115">Database name that contains letters, digits, and underscores (_). It cannot contain only digits or start with an underscore (_).</p>
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</td>
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</tr>
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<tr id="dli_08_0263__row160712191411"><td class="cellrowborder" valign="top" width="16.23%" headers="mcps1.3.4.2.2.3.1.1 "><p id="dli_08_0263__p3608320149">table_name</p>
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</td>
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<td class="cellrowborder" valign="top" width="83.77%" headers="mcps1.3.4.2.2.3.1.2 "><p id="dli_08_0263__p160812219141">Table name</p>
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</td>
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</tr>
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<tr id="dli_08_0263__row173647290145"><td class="cellrowborder" valign="top" width="16.23%" headers="mcps1.3.4.2.2.3.1.1 "><p id="dli_08_0263__p123641229111418">col_name</p>
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</td>
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<td class="cellrowborder" valign="top" width="83.77%" headers="mcps1.3.4.2.2.3.1.2 "><p id="dli_08_0263__p636492981417">Column name</p>
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</td>
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</tr>
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<tr id="dli_08_0263__row1346183911611"><td class="cellrowborder" valign="top" width="16.23%" headers="mcps1.3.4.2.2.3.1.1 "><p id="dli_08_0263__p746133911612">col_type</p>
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</td>
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<td class="cellrowborder" valign="top" width="83.77%" headers="mcps1.3.4.2.2.3.1.2 "><p id="dli_08_0263__p11461133901617">Field type</p>
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</td>
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</tr>
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<tr id="dli_08_0263__row1213495451419"><td class="cellrowborder" valign="top" width="16.23%" headers="mcps1.3.4.2.2.3.1.1 "><p id="dli_08_0263__p16134354141415">col_comment</p>
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</td>
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<td class="cellrowborder" valign="top" width="83.77%" headers="mcps1.3.4.2.2.3.1.2 "><p id="dli_08_0263__p813420545146">Column description</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section" id="dli_08_0263__en-us_topic_0156816309_section256972552612"><h4 class="sectiontitle">Precautions</h4><p id="dli_08_0263__p579810498197">Do not run this SQL statement concurrently. Otherwise, columns may be overwritten.</p>
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</div>
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<div class="section" id="dli_08_0263__en-us_topic_0156816309_section53871537273"><h4 class="sectiontitle">Example</h4><div class="codecoloring" codetype="Sql" id="dli_08_0263__en-us_topic_0156816309_screen1166013811137"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">t1</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="n">COLUMNS</span><span class="w"> </span><span class="p">(</span><span class="n">column2</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span><span class="w"> </span><span class="n">column3</span><span class="w"> </span><span class="n">string</span><span class="p">);</span>
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</pre></div></td></tr></table></div>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dli_08_0262.html">Modifying a Table</a></div>
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</div>
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</div>
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