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SqlServer_select-多次sum查询结果合并;

2014-03-29 09:09 351 查看
=>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...
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