Question

我正在尝试在MS SQL 2005中创建一个查询，它将4个日期范围的数据作为结果集中的单独列返回。

现在我的查询看起来像下面的查询。它工作正常，但我想为每个日期范围添加额外的列，因为它当前支持一个日期范围。

这将返回total1，total2，total3和total 4列，而不是像下面的当前查询那样返回单个总列。每个总数代表4个日期范围：

我很确定这可以使用案例陈述来完成，但不是100％。

任何帮助都一定会受到赞赏。

 SELECT  
       vendor,location,
      sum(ExtPrice) as total 

  FROM [database].[dbo].[saledata]
where processdate between '2010-11-03' and '2010-12-14'

and location <>''
and vendor <> ''

group by vendor,location with rollup

Answer 1

我通常这样做：

 SELECT  
       vendor,location,
      sum(CASE WHEN processdate BETWEEN @date1start AND @date1end THEN xtPrice ELSE 0 END) as total,
      sum(CASE WHEN processdate BETWEEN @date2start AND @date2end THEN xtPrice ELSE 0 END) as total2, 
      sum(CASE WHEN processdate BETWEEN @date3start AND @date3end THEN xtPrice ELSE 0 END) as total3, 
      sum(CASE WHEN processdate BETWEEN @date4start AND @date4end THEN xtPrice ELSE 0 END) as total4     
  FROM [database].[dbo].[saledata]

and location <>''
and vendor <> ''

group by vendor,location with rollup

您可以更改WHEN部分以制作所需的日期范围。

Answer 2

使用子查询，即

select sd.vendor, sd.location, sd1.total, sd2.total, sd3.total, sd4.total
from (select distinct vendor, location from saledata) AS sd
LEFT JOIN (
 SELECT vendor,location, sum(ExtPrice) as total 
  FROM [database].[dbo].[saledata]
where processdate between 'startdate1' and 'enddate1'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd1 on sd1.vendor=sd.vendor and sd1.location=sd.location

LEFT JOIN (
 SELECT vendor,location, sum(ExtPrice) as total 
  FROM [database].[dbo].[saledata]
where processdate between 'startdate2' and 'enddate2'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd2 on sd2.vendor=sd.vendor and sd2.location=sd.location

LEFT JOIN (
 SELECT vendor,location, sum(ExtPrice) as total 
  FROM [database].[dbo].[saledata]
where processdate between 'startdate3' and 'enddate3'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd3 on sd3.vendor=sd.vendor and sd3.location=sd.location

LEFT JOIN (
 SELECT vendor,location, sum(ExtPrice) as total 
  FROM [database].[dbo].[saledata]
where processdate between 'startdate4' and 'enddate4'
and location <>''
and vendor <> ''
group by vendor,location with rollup) sd4 on sd4.vendor=sd.vendor and sd4.location=sd.location

使用大小写创建多列数据

2 个答案: