（在线等待）表联合查询
有两个表:AA(name,aday（加班天数）),BB(name,bday（请假天数）),想实现下面的功能：

如果AA表的name与BB表的name同一人，那就aday - bday，如果AA有而BB没有或者BB有而AA没有，也要显示在DBGrid中。即：

AA BB

name aday name bday

BB 1 BB 2

CC 2 DD 1

EE 1 EE 1


查询显示结果应该是：

name day

BB -1

EE 0

CC 2

DD 1

哪位朋友帮忙一下，不胜感激！谢谢




[解决办法]
关注，帮顶
[解决办法]
Select IsNull(A.Name,B.Name) as Name,IsNull(A.ADay,0) as ADay,IsNull(B.BDay,0) as BDay
From AA A Full Join BB B On A.Name=B.Name

这样的问题都在问，看来你们的项目比较尴尬
[解决办法]

SQL code

select cc.name, sum(cc.aday) as [day] from (select name,aday from aa union all (select name,bday*-1 as aday from bb)) cc
[解决办法]
不好意思，上面的忘了group by 了
select cc.[name], sum(cc.aday) as [day] from (select [name],aday from aa union all (select [name],bday*-1 as aday from bb)) cc group by cc.[name]