SQL 练习14

  • 查询两门及其以上不及格课程的同学的学号，姓名及其平均成绩
SELECT Student.SId,Student.Sname,t.不及格课程数,t.平均成绩 from Student,

(SELECT SId, COUNT(CId) 不及格课程数,AVG(score) 平均成绩 FROM SC WHERE score <60 GROUP BY SId HAVING  COUNT(CId) >=2) as t

WHERE Student.SId = t.SId

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posted @ 2021-08-19 18:02  弩哥++  阅读(51)  评论(0)    收藏  举报