SqlServer_select-多次sum查询结果合并；

转自

http://blog.csdn.net/cyb_23/article/details/22472669

没事就瞎看看。如果一对多的关系，可以另外的表查询出来的数据作为一个字段。是平时想的太少，所以查询的时候方法还是少了点

比如a对b表一对多。select a.1,a.2,(select sum(b.price) from b表 where a.1=b.1)from a表

看到转的博主的介绍 未曾清贫难成人，不经敲打老天真，自古英雄炼狱来，繁荣富贵入凡尘

很有道理。南无阿弥佗佛。可惜现在人都很浮躁

-------------------------------------------------------转载内容为下--------------------------------------------------------------------------

=>背景介绍

->tableSales表



->第一次查询(2013销售员销售总额)

select salesName, sum(extendedPrice) as sumprice13 from tableSales where salesTime between '2013-01-01' and '2013-12-31' group by salesName



->第二次查询(2014销售员销售总额)

select  salesName, sum(extendedPrice) as sumprice14 from tableSales where salesTime between '2014-01-01' and '2014-12-31' group by salesName



->如何获得销售员13、14年的销售总额？

A、首先，我想到的就是用union all，但不理想；

select salesName, sum(extendedPrice) as sumprice13, null as sumprice14 from tableSales where salesTime between '2013-01-01' and '2013-12-31' group by salesName

union all

select  salesName, null as sumprice13, sum(extendedPrice) as sumprice14 from tableSales where salesTime between '2014-01-01' and '2014-12-31' group by salesName



B最后，通过fredrickhu版主大大的指点，修改如下：

SELECT

    a.salesName, a.sumprice13, b.sumprice14

FROM

    (SELECT

        salesName, SUM(extendedPrice) AS sumprice13

     FROM

        tableSales

     WHERE

        salesTime BETWEEN '2013-01-01' AND '2013-12-31'

     GROUP BY

        salesName

      ) AS a

INNER JOIN

     (SELECT

        salesName, SUM(extendedPrice) AS sumprice14

      FROM

        tableSales

      WHERE

        salesTime BETWEEN '2014-01-01' AND '2014-12-31'

      GROUP BY

        salesName

      ) AS b

ON a.salesName=b.salesName

 



最后再次感谢fredrickhu大大！谢谢！..风雨兼程...