Question

我有一个SQL查询，如下所示：

    SELECT
        EVENTTYPEDESCRIPTION,
        YEAR(EVENTSTARTDATE) as 'EVENTYEAR',
        COUNT(PARTICIPANTID) AS 'TOTALPARTICIPANTS'
    FROM WEBPROGRAMPARTICIPANTS
    INNER JOIN WEBPROGRAMS
        ON WEBPROGRAMPARTICIPANTS.PROGRAMCODE = WEBPROGRAMS.PROGRAMCODE
    INNER JOIN WEBEVENTS
        ON WEBPROGRAMS.PROGRAMID = WEBEVENTS.EVENTID
    INNER JOIN WEBEVENTTYPEDESCRIPTIONS
        ON WEBEVENTS.EVENTTYPE = WEBEVENTTYPEDESCRIPTIONS.EVENTTYPE
    WHERE WEBPROGRAMPARTICIPANTS.ACCEPTED = 1
    GROUP BY EVENTTYPEDESCRIPTION, YEAR(EVENTSTARTDATE)
    ORDER BY EVENTTYPEDESCRIPTION, YEAR(EVENTSTARTDATE)

返回以下结果：

EventTypeDescripti  Year    TotalParticipants
Affiliate Workshop  2004    96
Affiliate Workshop  2005    132
Affiliate Workshop  2006    94
Affiliate Workshop  2007    125
Affiliate Workshop  2008    121
Affiliate Workshop  2010    170
Affiliate Workshop  2011    1
IPAM Long Program   2000    59
IPAM Long Program   2001    203
IPAM Long Program   2002    94
IPAM Long Program   2003    182
IPAM Long Program   2004    147
IPAM Long Program   2005    123
IPAM Long Program   2006    99
IPAM Long Program   2007    116
IPAM Long Program   2008    98
IPAM Long Program   2009    127
IPAM Long Program   2010    147
IPAM Long Program   2011    105
IPAM Long Program   2012    14
IPAM Reunion Conference 2002    108
IPAM Reunion Conference 2003    100
IPAM Reunion Conference 2004    98
IPAM Reunion Conference 2005    68

我的问题是如何重新构建查询以显示浓缩为一行的每个EventTypeDescription，并将每年显示为具有相应计数的列

示例：

Description            Year            Year           etc...
Affiliate Workshop     96              132            ....

Answer 1

好的，因为我不知道你的结果的每一列来自哪个表，所以我将不得不使用临时表。然后，你将需要动态sql，所以先看看this link。然后，尝试这样的事情：

DECLARE @Years NVARCHAR(MAX), @Query NVARCHAR(MAX)
SET @Years = ''

SELECT eventtypedescription, 
       YEAR(eventstartdate) AS 'EVENTYEAR', 
       COUNT(participantid) AS 'TOTALPARTICIPANTS' 
INTO #Results
FROM   webprogramparticipants 
INNER JOIN webprograms 
 ON webprogramparticipants.programcode = webprograms.programcode 
INNER JOIN webevents 
 ON webprograms.programid = webevents.eventid 
INNER JOIN webeventtypedescriptions 
 ON webevents.eventtype = webeventtypedescriptions.eventtype 
WHERE  webprogramparticipants.accepted = 1 
GROUP  BY eventtypedescription, YEAR(eventstartdate) 


SELECT @Years = @Years + '[Year ' + CAST(EVENTYEAR AS VARCHAR) +'],'
FROM #Results
GROUP BY EVENTYEAR
ORDER BY EVENTYEAR

SET @Years = LEFT(@Years,LEN(@Years)-1)

SET @Query = '
SELECT *
FROM (  SELECT eventtypedescription, TOTALPARTICIPANTS, ''Year ''+CAST(EVENTYEAR AS VARCHAR) Years
        FROM #Results) T
PIVOT(SUM(TOTALPARTICIPANTS) FOR Years IN ('+@Years+')) AS PT'

EXEC sp_executesql @Query

Answer 2

使用游标生成一个字符串，其中包含您需要的行
使用数据透视表pivot EventTypeDescription列上的数据。示例就在路上。

Answer 3

谢谢大家的努力。一旦我们的数据库升级到2008，我将记住PIVOT示例。现在，因为我们使用的是SQL Server 2000，所以我决定在我的c＃代码中进行透视。

无论如何，这种方式实际上更好，因为Icreaetd的方式我可以传入任何选择的查询结果，它会转动它。

SQL查询需要像行一样组合

3 个答案: