mysql 查询某字段里含有(或者不含)某字符的所有记录方法(转)

select gid, username from users where FIND_IN_SET(8,gid); //查询gid里含有数字8的记录，gid是varchar ,数据格式:"1,12,8,18,5"

select gid, username from users where !FIND_IN_SET(8,gid); //查询gid里不含有数字8的记录，gid是varchar ,数据格式:"1,12,8,18,5"