o 6. GROUP BY deptno)) WHERE deptno!=a.deptn SELECT dname FROM dept WHERE deptno=(SELECT deptno FROM emp a GROUP BY deptno HAVING avg(sal)>all(SELECT avg(sal) FROM em 在这条 SELECT 语句中,最后一个子查询最先......
# from (select … table)示例 将一个 table 的查询结果当做一个新表进行查询 select * from ( select id, name from student where sex = 1 ) t where t.id > 2; 上面括号中的语句,就是子查询语句(部查询)。在外面的是......
本查询可以用集函数来实现,首先用子查询找出 IS 系中最大年龄(19), 然后在父查询中查所有非 IS 系且年龄小于19岁的学生姓名及年龄,SQL 语句 如下: SELECT Sname,Sage FROM Student WHERE Sage< (SELECT MAX(Sage) FROM Student......
