今天删除数据，写了这么条sql语句，

DELETE   from  sys_menus s WHERE s.MENU_ID in (86,87,88);

结果报错。。

[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 's WHERE s.MENU_ID in (86,87,88)' at line 1

后来一查，mysql使用别名有固定的语法。

当然不用也行：DELETE  from  sys_menus   WHERE  MENU_ID in (86,87,88);

用别名的：DELETE s from  sys_menus s WHERE s.MENU_ID in (86,87,88);

转的！原博文网址：http://blog.csdn.net/chs_jdmdr/article/details/46708917

mysql delete 语句中使用别名 alias

delete <alias> from <table> <alias> where <alias>.<field>...

别名必需在 delete之后出一次。

多表间删除语法：

DELETE t1, t2 FROM t1 INNER JOIN t2 INNER JOIN t3

WHERE t1.id=t2.id AND t2.id=t3.id;

Or:

DELETE FROM t1, t2 USING t1 INNER JOIN t2 INNER JOIN t3

WHERE t1.id=t2.id AND t2.id=t3.id;

LEFT JOIN:

DELETE t1 FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.id IS NULL;