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Mysql中的find_in_set的使用方法介绍_MySQL

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Release： 2016-06-01 13:23:59
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使用举例：

用户表(user)中的一个字段(purview)代表该用户的权限

将用户的所有权限id存入此字段。比如有：1,2,3,4,5这样的五个权限

查找哪些用户拥有权限id为1的权限


select * from user where find_in_set('1',purview);

sql语句

sql解释：查出所有拥有1这个权限的所有用户的信息。

这样设计数据表的目的是减少表的数量，但是会增加更新的难度！

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