select sum(grade) sum_grade from stu s
where s.id in(
select t1.id from stu t1
inner join stu t2
on t1.id=t2.c_id
);
select * from stu;
where s.id in(
select t1.id from stu t1
inner join stu t2
on t1.id=t2.c_id
);
select * from stu;
SQL语句in求和
最新推荐文章于 2021-01-28 10:09:09 发布
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