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  • 行列转换的例子

    IF OBJECT_ID('tempdb..#ABC') IS NOT NULL  
    DROP TABLE #ABC  
      
    create table #ABC  
    (  
    ID  INT  
    ,UserID BIGINT    
    ,UserExamID INT   
    ,TestPaperID INT      
    ,QuestionID INT  
    ,AnswerID   INT  
    ,Ctime DATETIME  
    )  
    INSERT INTO #ABC  
    SELECT 1,120629210042331600,1,3,22,49,GETDATE() UNION ALL  
    SELECT 2,120629210042331600,1,3,23,51,GETDATE() UNION ALL  
    SELECT 3,120629210042331600,1,3,24,56,GETDATE() UNION ALL  
    SELECT 4,120629210042331600,1,3,25,62,GETDATE() UNION ALL  
    SELECT 5,120629210042331600,1,3,26,66,GETDATE() UNION ALL  
    SELECT 6,120629210042331600,1,3,27,72,GETDATE() UNION ALL  
    SELECT 7,120629210042331600,1,3,28,77,GETDATE() UNION ALL  
    SELECT 8,120629210042331600,1,3,29,81,GETDATE() UNION ALL  
    SELECT 9,120629210042331600,1,3,30,86,GETDATE() UNION ALL  
    SELECT 10,120629210042331600,1,3,31,90,GETDATE() UNION ALL  
    SELECT 1,120629210011732588,1,3,22,49,GETDATE() UNION ALL  
    SELECT 2,120629210011732588,1,3,23,51,GETDATE() UNION ALL  
    SELECT 3,120629210011732588,1,3,24,56,GETDATE() UNION ALL  
    SELECT 4,120629210011732588,1,3,25,62,GETDATE() UNION ALL  
    SELECT 5,120629210011732588,1,3,26,66,GETDATE() UNION ALL  
    SELECT 6,120629210011732588,1,3,27,72,GETDATE() UNION ALL  
    SELECT 7,120629210011732588,1,3,28,77,GETDATE() UNION ALL  
    SELECT 8,120629210011732588,1,3,29,81,GETDATE() UNION ALL  
    SELECT 9,120629210011732588,1,3,30,86,GETDATE() UNION ALL  
    SELECT 10,120629210011732588,1,3,31,90,GETDATE()    
      
    SELECT * FROM #ABC  
    
    
    DECLARE @s NVARCHAR(4000)  
    SELECT @s = ISNULL(@s + ',', '') +  QUOTENAME(QuestionID)  
    FROM  (select distinct QuestionID from #ABC) as A ---列名不要重复  
      
    Declare @sql NVARCHAR(4000)  
    SET @sql='  
     select r.* from  
    (select UserID,QuestionID,AnswerID from #ABC) as t  
    pivot  
    (  
    max(t.AnswerID)  
    for t.QuestionID in ('+@s+')  
    ) as r'  
       
    EXEC( @sql) 

    如果要消除NULL,可以利用@s构造一个 ISNULL(字段.0) AS [字段]

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  • 原文地址:https://www.cnblogs.com/songr/p/7085971.html
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