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当清空一个表的时候，重新插入数据，发现auto_increment属性的字段计数不是从1开始的时候，可以使用以下命令
方法一
delete from test;
alter table `test` auto_increment=1
（好处，可以设置AUTO_INCREMENT 为任意值开始）
提示：如果表列和数据很多，速度会很慢，如90多万条，会在10分钟以上。
方法二
truncate table test
（好处，简单，AUTO_INCREMENT 值重新开始计数）
摘自 ay暗影
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