我有一个表有两个字段sesskey(varchar32,index)和产品(int11)的表,现在我必须删除所有具有group by sesskey count(*)= 1的行.我正在尝试一些方法,但都失败了.
例:
delete from taged where sesskey in (select sesskey from taged group by sesskey having count(*) = 1)
sesskey字段不能成为主键,因为它重复了.