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'SQL Server中DISTINCT关键字的用法SQL Server中的DISTINCT关键字是用来去除重复记录的，它可以用来检索不重复的结果集。DISTINCT关键字可以用于任何列，也可以用于多列'

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'2025-02-22 00:28:28'

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<h3>SQL Server中DISTINCT关键字的用法</h3>
<p>SQL Server中的DISTINCT关键字是用来去除重复记录的，它可以用来检索不重复的结果集。DISTINCT关键字可以用于任何列，也可以用于多列，它可以用于SELECT语句，UPDATE语句和DELETE语句。</p>

<h3>使用方法</h3>
<p>DISTINCT关键字的使用方法有两种：</p>
<ul>
<li><strong>单列使用DISTINCT关键字：</strong>
<pre>SELECT DISTINCT 列名 FROM 表名</pre>
</li>
<li><strong>多列使用DISTINCT关键字：</strong>
<pre>SELECT DISTINCT 列名1, 列名2 FROM 表名</pre>
</li>
</ul>
<p>上述两种使用方法，DISTINCT关键字会检索出不重复的记录，以上述例子，如果表中有多条记录，但是其中有一列或者多列是重复的，那么DISTINCT关键字只会检索出一条记录。</p>
<p>当使用DISTINCT关键字时，可以使用WHERE子句来对检索出的结果集进行过滤，也可以使用ORDER BY子句来对检索出的结果集进行排序。</p>
<p>DISTINCT关键字是一个非常有用的关键字，它可以帮助我们快速检索出不重复的记录，使用起来也非常简单。</p>                

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