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    <td align="center" valign="middle" class="til"><h3>&nbsp;&nbsp; MS SQL基础教程:数据查询-SELECT语句 </h3>
      发布时间：2007-12-25 来源：网络/责编：编程入门 作者：佚名<br />
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</table><p>　　数据库是为更方便有效地管理信息而存在的人们，希望数据库可以随时提供所需要的数据信息。因此，对用户来说，数据查询是数据</p>
<p>　　库最重要的功能。本章将讲述数据查询的实现方法。</p>
<p>　　在数据库中，数据查询是通过SELECT 语句来完成的。SELECT 语句可以从数据库中按用户要求检索数据，并将查询结果以表格的形式返回。我们在&ldquo;Transact-SQL 语言&rdquo;章节及前面的章节中已经初步接触到了SELECT 语句的一些用法，在本章中将分类讲述其具体用法。</p>
<p>　　本节讲述SELECT 语句完整的语法结构，这是一个非常冗长、枯燥的过程。读者可以跳过本节，从第二节开始阅读，而将本节作为理解、编写查询语句的语法参考资料。 SELECT 语句完整的语法结构如下：</p>
<p>　　SELECT statement ::=</p>
<p>　　&lt;query_expression&gt;</p>
<p>　　[ ORDER BY { order_by_expression | column_position [ ASC | DESC ] } [,...n] ]</p>
<p>　　[ COMPUTE { { AVG | COUNT | MAX | MIN | SUM } (expression) } [,...n]</p>
<p>　　[ BY expression [,...n] ] ]</p>
<p>　　[ FOR { BROWSE | XML { RAW | AUTO | EXPLICIT }</p>
<p>　　[ , XMLDATA ]</p>
<p>　　[ , ELEMENTS ]</p>
<p>　　[ , BINARY base64 ] }</p>
<p>　　[ OPTION (&lt;query_hint&gt; [,...n]) ]</p>
<p>　　&lt;query expression&gt; ::=</p>
<p>　　{ &lt;query specification&gt; | (&lt;query expression&gt;) }</p>
<p>　　[UNION [ALL] &lt;query specification | (&lt;query expression&gt;) [...n] ]</p>
<p>　　&lt;query specification&gt; ::=</p>
<p>　　SELECT [ ALL | DISTINCT ]</p>
<p>　　[ {TOP integer | TOP integer PERCENT} [ WITH TIES] ]</p>
<p>　　&lt;select_list&gt;</p>
<p>　　[ INTO new_table ]</p>
<p>　　[ FROM {&lt;table_source&gt;} [,...n] ]</p>
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      <p>上一篇：<a href='/data/SQLServer/jc/200712/6194.htm'>MS SQL基础教程:数据库缺省值</a>  &nbsp; 下一篇：<a href='/data/SQLServer/jc/200712/6196.htm'>MS SQL基础教程:SELECT语句的应用</a> </p></td>
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