sql两个表做链接再分组 sql分组查询

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两张表联合查询部分你没写 加上inner join 成绩表 语句 我只提示你这些.自己做下. 给你答案就让你失去一次学习的机会了

假设两个表为 a,b select ※ from a natural join b;

select sum(a.price) as sumprice,count(a.oid) as countoid,a.uname,b.city,b.tel from ORDERS_INFO a inner join USER_INFO b on a.uname=b.username where a.uname = 13 .

select * from ( select uniqid , calltime from dbo.apilog where uniqid = 100 union select uniqid , calltime from dbo.apilog where uniqid = 200 ) as ta group by ta.calltime , ta.uniqid;

select * from sxh where kicket_n in (select kicket_n from sxh group by kicket_n having count(*)>1) and czy in (select czy from sxh group by czy having count(*)>1)

1 2 3 4 5 6 7 8 9 10 11 selecta.lqr, (selectsum(sl) fromt2 wherea.lqr = t2.lqr) kc, (selectsum(sl) fromt1 wherea.lqr = t1.lqr) lq from ( selectlqr fromt1 union selectlqr fromt2 ) a

如果你的UID是int型先进行转换,然后截取前两位,在用聚合函数获取总数,进行分组查询就好了,语句如下(把表名替换下可以直接用):select SUBSTRING(CONVERT(varchar(50),UID),0,3),COUNT(*) from 表 group by SUBSTRING(CONVERT(varchar(50),UID),0,3)

不知道你要这么连,下面也是一种连法: select * from table1 union select siteid,null type,null name from table2

使用触发器 create trigger trg_A on A for update,delete as begin if exists(select 1 from inserted) update B set Name=(select Name from inserted) where Name=(select Name from deleted) else delete B where Name=(select Name from deleted) end go 这个就可以了,你改成你的试试

select a, b from 表 group by a,b having count(1)=1

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