分别用一条SQL语句完成以下题目的操作: 1. 查询年龄为19岁的女同学的...
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1
select sno,sname from s where ssex='女' and sage=19
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select cname,clocation from c where clocation='主楼' order by teacher
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select sno from sc where grade>=80 and cno in (select cno from c where cname='数据库原理')
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select s.sno,s.sname,avg(grade) from s,c,sc where s.sno=sc.sno and c.cno=sc.cno group by s.sno,s.sname
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selete from sc where cno in (select cno from sc group by cno having count(*)<=10)
