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三表联合查询.用一条查询语句,查出各姓名的数值余额

2008-03-20 09:52:12| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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用一条查询语句,查出各姓名的数值余额.我是要做成视图的.

用户表:
姓名
a
b
c
....

扣费表:
姓名数值
a 3.5
b 5.2
a 2
...

充值表:
姓名数值
b 10
a 10
a 10.5
...

返回:
姓名差额(充值和-扣费和)

select 姓名,差额=sum(数值)
from(
select 姓名,数值 from 充值表
union all
select 姓名,-数值 from 扣费表
)a group by 姓名

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              blogAbstract:'用一条查询语句,查出各姓名的数值余额.我是要做成视图的.   <BR\>    <BR\>  用户表:   <BR\>  姓名   <BR\>  a   <BR\>  b   <BR\>  c   <BR\>  ....   <BR\>    <BR\>  扣费表:   <BR\>  姓名   数值   <BR\>  a   3.5   <BR\>  b   5.2   <BR\>  a   2   <BR\>  ...   <BR\>    <BR\>  充值表:   <BR\>  姓名   数值   <BR\>  b   10   <BR\>  a   10   <BR\>  a   10.5   <BR\>  ...   <BR\>    <BR\>  返回:   <BR\>  姓名     差额(充值和-扣费和)   <BR\><BR\><BR\>\r\n<P\>select   姓名,差额=sum(数值)   <BR\>  from(   <BR\>      select   姓名,数值   from   充值表   <BR\></P\>',
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