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20200326 连接子查询作业
2020-07-24 10:57老师讲的第四种答案
select * from tb_lemon_score t1 where not exist (select * from tb_lemon_score t2 where t1.sname=t2.sname and t2.score <=80)
可以改成 select * from tb_lemon_score t1 where t1.sname not exist (select * from tb_lemon_score t2 where t2.score <=80) 吗？课堂上发不出去。。