Question

我在SQL Server 2014上运行了以下SQL Query（感谢Thorsten！）。目前，我将输出导出到Excel 2013并从那里运行我的数据透视表。我知道有一种方法可以编写SQL PIVOT查询，以便输出与Excel中的输出完全相同。

我的SQL查询如下：

SELECT 
  b.PropertyCode,
  x.[ReservationStayID],
  x.[Nights Spent],
  x.[MTH],
  x.[Rate],
  x.CreatedOn,
  x.[DateOfArrival],
  x.[DateOfDeparture]

 FROM GuestNameInfo a
 JOIN GuestStaySummary b ON a.ReservationStayID = b.ReservationStayID
 LEFT JOIN ReservationStay c ON c.ReservationStayID = b.ReservationStayID
 LEFT JOIN
 (
   SELECT 
     ReservationStayID,
     datename(m,StayDate) + ' ' + cast(datepart(yyyy,StayDate) as varchar) as [MTH],
     count(*) AS [Nights Spent],
     avg(RateAmount) as [Rate],
     min(CreatedOn) as CreatedOn,
     min(StayDate) as [DateOfArrival],
     max(StayDate) as [DateOfDeparture]
   FROM ReservationStayDate
  GROUP BY ReservationStayID, datename(m,StayDate) + ' ' + cast(datepart(yyyy,StayDate) as varchar)
 ) x ON x.ReservationStayID = b.ReservationStayID

 WHERE a.PrimaryGuest = '+'

 AND NOT a.DepartureDate < '2014-11-01'

 AND NOT (b.ReservationStatus = 'CANCELED' OR b.ReservationStatus = 'NOSHOW')

 AND NOT b.MarketSegmentCode = 'COMP'

我需要SQL PIVOT代码给我以下输出：

PropertyCode     October 2014   November 2014  ....... April 2015

  AB                256              154        ......  247
  SD                143              315        ......  189

上述输出中的值是Nights Spent的总和。

当前SQL查询的输出如下：

PropertyCode     ReservationStayId    Nights Spent   MTH            Rate ......Date of Departure
AB                  5123                  12         November 2014   125.30 ....  2014-11-25

Answer 1

首先，将yout查询结果放入临时表：

SELECT 
  b.PropertyCode,
  x.[ReservationStayID],
  x.[Nights Spent],
  x.[MTH],
  x.[Rate],
  x.CreatedOn,
  x.[DateOfArrival],
  x.[DateOfDeparture]

 INTO #tmp /*HERE*/

 FROM GuestNameInfo a
 JOIN GuestStaySummary b ON a.ReservationStayID = b.ReservationStayID
 LEFT JOIN ReservationStay c ON c.ReservationStayID = b.ReservationStayID
 LEFT JOIN
 (
   SELECT 
     ReservationStayID,
     datename(m,StayDate) + ' ' + cast(datepart(yyyy,StayDate) as varchar) as [MTH],
     count(*) AS [Nights Spent],
     avg(RateAmount) as [Rate],
     min(CreatedOn) as CreatedOn,
     min(StayDate) as [DateOfArrival],
     max(StayDate) as [DateOfDeparture]
   FROM ReservationStayDate
  GROUP BY ReservationStayID, datename(m,StayDate) + ' ' + cast(datepart(yyyy,StayDate) as varchar)
 ) x ON x.ReservationStayID = b.ReservationStayID

 WHERE a.PrimaryGuest = '+'

 AND NOT a.DepartureDate < '2014-11-01'

 AND NOT (b.ReservationStatus = 'CANCELED' OR b.ReservationStatus = 'NOSHOW')

 AND NOT b.MarketSegmentCode = 'COMP'

然后只选择有关枢轴的列（使用##进入全局临时）：

SELECT PropertyCode,[Nights Spent] as Nights,MTH
INTO ##temporary_for_pivot
FROM #tmp

然后选择临时列名的值（这里可以为列命令...）：

IF OBJECT_ID('tempdb..#temp_for_columnames') IS NOT NULL DROP TABLE #temp_for_columnames
SELECT DISTINCT MTH
INTO #temp_for_columnames
FROM ##temporary_for_pivot

然后创建动态数据透视表脚本（因为你不知道列数）并运行它：

DECLARE @COLUMNS VARCHAR(MAX) 
SET @COLUMNS = 
STUFF(CAST((SELECT ',' + QUOTENAME(MTH) FROM #temp_for_columnames FOR XML PATH(''), TYPE) AS VARCHAR(MAX)),1,1,'')

DECLARE @cmd VARCHAR(MAX) 

SET @cmd = 'SELECT PropertyCode, '+@COLUMNS+'
            FROM ##temporary_for_pivot
            PIVOT ( SUM(Nights) FOR MTH IN ('+@COLUMNS+')) x'

EXEC(@cmd)

完成：）

如何从此SQL查询编写PIVOT查询

1 个答案: