--exists 结合 if else 以及 where 条件来使用判断是否有数据满足条件 select * from Class where Name like '%[1-3]班' if (not exists(select * from Class where len(Name)>=5)) se Read More
posted @ 2020-08-04 17:36 CR7Ronaldo Views(901) Comments(0) Diggs(0)