求化

SQL code

select name from STUDENT where id in (select studentid from EXAM where score in(SELECT score FROM EXAM WHERE lessonid='10004' group by score having score <=(select avg(score) from EXAM where Lessonid ='10004') )and lessonid ='10004')

查句有有一的法呢
或者用存程？

[解决办法]
你的语句怎么要4层查询啊？太复杂了吧？不就是找出10004这门课低于平均分的学生吗？试试下面的，没数据不要测

SQL code

SELECT  nameFROM    STUDENTWHERE   id IN ( SELECT  studentid                FROM    EXAM                WHERE   lessonid = '10004'                        AND score <= ( SELECT   AVG(score)                                       FROM     EXAM                                       WHERE    Lessonid = '10004'                                     ) )