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sql sErvEr group By 嵌套 group By 问题

group by 前面要加个别名, select cuid from (select cuid,eid from test_sale group by cuid,eid ) as t1 group by cuid having count(eid)>=2 或者此查询也可以直接改为如下 select cuid from test_sale group by cuid having count(eid) >= 2

可以,例如 SELECT aa, COUNT(bb) FROM ( SELECT aa, bb FROM T GROUP BY aa, bb ) GROUP BY aa

可以的,因为你可以将第一个GROUP BY的SELECT 语句看成一个视图,那是否能对一个视图进行GROUP BY 答案肯定是可以的。

Group by 是SQL Server 中常用的一种语法,语法如下: [ GROUP BY [ ALL ] group_by_expression [ ,...n ] [ WITH { CUBE | ROLLUP } ]] 1、最常用的就是这种语法,如下: Select CategoryID, AVG(UnitPrice), COUNT(UnitPrice) FROM dbo.Produc...

SELECT id, name= ( STUFF(( SELECT ',' + name FROM A WHERE id= Test.id FOR XML PATH('') ), 1, 1, '') ) , DATE= ( STUFF(( SELECT ',' + DATE FROM A WHERE id= Test.id FOR XML PATH('') ), 1, 1, '') ) FROM A AS Test GROUP BY id;

可以出现,你的查询语句是先进行多表连接,然后再分组,如果你想在结果中出现B表字段,要么出现的是对B表字段聚合函数的使用(例如:max(B.c1) ),要么就在分组中也把你想要的B字段加进去,如果你分组并不象针对B造成影响,那也可以在结果集中使...

跟几个表没有关系,聚合函数之外的字段,group by 中都要列出 如student,score select a.sno,a.sname,sum(b.value) from student a,score b where a.sno=b.sno group by a.sno,a.sname a.sno,a.sname 必须出现在group by 中

在select 列表中出现的未使用聚合函数的都要在group by 中出现 以上应改为 select Orders.c_ID,Customers.c_TrueName,sum(o_Sum) as 个人订单总额 from Orders join Customers on Orders.c_ID=Customers.c_ID group by Orders.c_ID,Customers.c_...

你可以这样写select u.use002, g.gzl011,g.gzl002,g.gzl005,sum(datediff(MI,g.gzl006,g.gzl007)) from ysbook_010.dbo.ysgzl g,ysdata.dbo.xtuse u where g.gzl010 = u.use001 group u.use002,g.gzl011,g.gzl002,g.gzl005

不一定,如: [TEST@ora1] SQL>select id from test1; ID ---------- 1 2 [TEST@ora1] SQL>select sum(id) from test1; SUM(ID) ---------- 3 --- 以上,希望对你有所帮助。

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