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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>索引</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 8 页（共17 页）</nobr></font></td>
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<p>索引可以：</p>
<ul>
<li>是升序或是降序（如果没有指定，缺省值是升序）</li>
<li>是唯一的，也可以是不唯一的（如果没有指定，缺省值是不唯一的）</li>
<li>是复合的</li>
<li>用来执行群集</li>
<li>是双向的（这由 <code>allow</code> 或 <code>disallow reverse scans</code> 控制的）						</li>
<li>包括其它列（这只适用于唯一索引）。</li>
</ul>
<p>下面的多个 <code>create unique</code> 语句说明了上面这些选项：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
create unique index itemno on albums (itemno) desc
create index clx1 on stock (shipdate) cluster allow reverse scans
create unique index incidx on stock (itemno) include (itemname)
create index item on stock (itemno) disallow reverse scans collect detailed statistics
</code>
</pre>
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