a) update score set sc_sco=sc_sco+10 where sc_no='345';
b) select a.st_no,a.st_name from STUDENT a,score b
where a.st_no = b.sc_stno and b.sc_no='123' and b.sc_sco>80;
c)select a.st_no,a.st_name ,a.st_age,b.sumsco
from STUDENT a,(select sc_stno ,sum(sc_sco) as sumscore from score group by sc_stno) b
where a.st_no=b.sc_stno;作者: 喝少了想上树 时间: 2012-6-29 00:17 回复 1#fish1689999
a)update score set sc_sco=sc_sco+10 where sc_no=345
b)select t1.st_no,t1.st_name from student t1,score t2 where t1.st_no=t2.sc_stno
and t2.sc_no=123
and t2.sc_sco>80作者: 喝少了想上树 时间: 2012-6-29 09:04
a)update score set sc_sco=sc_sco+10 where sc_no=345
c)select t1.st_no,t1.st_name,sum(t2.sc_sco)from student t1,score t2 where t1.st_no=t2.sc_no group by t2.sc_no ;作者: q315585646 时间: 2012-7-4 09:31
不错不错