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<ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">README</a></li><li class="chapter-item expanded "><a href="1-SQL基础知识.html">SQL基础知识</a></li><li class="chapter-item expanded "><a href="2-MySQL安装.html">MySQL安装</a></li><li class="chapter-item expanded "><a href="3-MySQL管理.html">MySQL管理</a></li><li class="chapter-item expanded "><a href="4-数据类型.html">数据类型</a></li><li class="chapter-item expanded "><a href="5-创建数据表.html">创建数据表</a></li><li class="chapter-item expanded "><a href="6-删除数据表.html">删除数据表</a></li><li class="chapter-item expanded "><a href="7-修改数据.html">修改数据</a></li><li class="chapter-item expanded "><a href="8-查询数据表.html">查询数据表</a></li><li class="chapter-item expanded "><a href="9-MySQL数据处理.html">MySQL数据处理</a></li><li class="chapter-item expanded "><a href="10-MySQL事务.html">MySQL事务</a></li><li class="chapter-item expanded "><a href="11-建立索引.html">建立索引</a></li><li class="chapter-item expanded "><a href="12-临时表.html">临时表</a></li><li class="chapter-item expanded "><a href="13-自增序列.html" class="active">自增序列</a></li><li class="chapter-item expanded "><a href="14-重复数据.html">重复数据</a></li><li class="chapter-item expanded "><a href="15-MySQL常用函数.html">MySQL常用函数</a></li></ol>
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<h2 id="自增序列"><a class="header" href="#自增序列">自增序列</a></h2>
<p>MySQL序列是一组整数：1, 2, 3, ...，由于一张数据表只能有一个字段自增主键， 如果你想实现其他字段也实现自动增加，就可以使用MySQL序列来实现。</p>
<h3 id="使用自增序列"><a class="header" href="#使用自增序列">使用自增序列</a></h3>
<pre><code class="language-sql"># 使用 MySQL AUTO_INCREMENT 来定义列。
CREATE TABLE insect
(
id INT UNSIGNED NOT NULL AUTO_INCREMENT = 100,
PRIMARY KEY (id),
name VARCHAR(30) NOT NULL, # type of insect
date DATE NOT NULL, # date collected
origin VARCHAR(30) NOT NULL # where collected
);
</code></pre>
<h3 id="获取auto_increment值"><a class="header" href="#获取auto_increment值">获取AUTO_INCREMENT值</a></h3>
<p>在MySQL的客户端中你可以使用 SQL中的LAST_INSERT_ID( ) 函数来获取最后的插入表中的自增列的值。</p>
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