真题

牛客网，网易校招 select Sname from S ​where SNo not in ​(select SNO ​from SC ​where cno not in (select cno ​from C ​where​ ​CTEACHER==‘小易’)) ​ ​select sname,ave(sum(score)) ​from S ​join SC ​on S.SNO=SC.SNO ​

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