常用sql語句

select  name from student where name not in (select  name from student where scount<=100)

 

select distinct name from student where scount<=80

select name from student where scount<=80

select distinct name  from student where name not in(select distinct name from student where scount<=80)

select distinct name from student where scount>80

delete from student where classid not in(select min(classid) from student group by classid)