一些比較難的SQL語句查詢

1查詢各科成績都高於90分的人。 有一張表： stu_course: mysql>select t1.stu_id,t1.no from (select stu_id,count(*) no from stu_course group by stu_id)t1 inner join (select stu_id,count(*) no from stu_course where score >=9

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