Question

如果这是重复的话，请道歉，但我的方案非常具体到提供的示例。

这个PIVOT Logic导致它返回所有不需要的空值而不是只返回需要列的1行有什么问题。（已经太长时间了。）

SELECT ENTITY_VAL, [12],[11],[10],[9],[8],[7],[6],[5],[4],[3],[2],[1]
    FROM
    (
    SELECT ROW_NUMBER() OVER(ORDER BY CONVERT(DATE, DATEADD(dd, -1, DATEADD(mm, DATEDIFF(mm, 0, D) + 1, 0)),121) DESC) ID 
    ,DATEPART(YEAR, D) YR
    ,DATEPART(MONTH, D) MNTH
    --,RIGHT('00' + CAST(DATEPART(mm, D) AS VARCHAR(02)), 2) MNTH2
    ,CONVERT(DATE, D, 101) FIRSTOFMONTH
    ,CONVERT(DATE, DATEADD(dd, -1, DATEADD(mm, DATEDIFF(mm, 0, D) + 1, 0)),121) LASTOFMONTH
    , 1111111 ENTITY_VAL
    FROM
        (
          SELECT D = DATEADD(MONTH, XM.RN, @StartDate)
          FROM 
          (
            SELECT TOP (DATEDIFF(MONTH, @StartDate, @CutoffDate)) 
              RN = ROW_NUMBER() OVER (ORDER BY AO.[object_id])
            FROM sys.all_objects AS AO
            CROSS JOIN sys.all_objects AS AO2
            -- on my system this would support > 5 million days
            ORDER BY AO.[object_id]
          ) AS XM
        ) AS XY
    --ORDER BY LASTOFMONTH ASC
    ) AS BASE
    PIVOT
    (
        MAX(FIRSTOFMONTH) FOR ID IN ([12],[11],[10],[9],[8],[7],[6],[5],[4],[3],[2],[1])
    ) AS PVT

我得到了这个（不是我想要的）：

ENTITY_VAL  12         11         10         9          8          7          6          5          4          3          2          1
----------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
1111111     2016-11-01 NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL
1111111     NULL       2016-12-01 NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL
1111111     NULL       NULL       2017-01-01 NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL
1111111     NULL       NULL       NULL       2017-02-01 NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL
1111111     NULL       NULL       NULL       NULL       2017-03-01 NULL       NULL       NULL       NULL       NULL       NULL       NULL
1111111     NULL       NULL       NULL       NULL       NULL       2017-04-01 NULL       NULL       NULL       NULL       NULL       NULL
1111111     NULL       NULL       NULL       NULL       NULL       NULL       2017-05-01 NULL       NULL       NULL       NULL       NULL
1111111     NULL       NULL       NULL       NULL       NULL       NULL       NULL       2017-06-01 NULL       NULL       NULL       NULL
1111111     NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       2017-07-01 NULL       NULL       NULL
1111111     NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       2017-08-01 NULL       NULL
1111111     NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       2017-09-01 NULL
1111111     NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       NULL       2017-10-01

而不是这个（我想要的）：

ENTITY_VAL  12         11         10         9          8          7          6          5          4          3          2          1
----------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
1111111     2016-11-01 2016-12-01 2017-01-01 2017-02-01 2017-03-01 2017-04-01 2017-05-01 2017-06-01 2017-07-01 2017-08-01 2017-09-01 2017-10-01

Answer 1

我修好了，这是过多的栏目＆＃34;膨胀＆＃34; PIVOT。

更新了逻辑：

SELECT ENTITY_VAL, [12],[11],[10],[9],[8],[7],[6],[5],[4],[3],[2],[1]
    FROM
    (
    SELECT ROW_NUMBER() OVER(ORDER BY CONVERT(DATE, DATEADD(dd, -1, DATEADD(mm, DATEDIFF(mm, 0, D) + 1, 0)),121) DESC) ID         
    ,CONVERT(DATE, D, 101) FIRSTOFMONTH
    ,1111111 ENTITY_VAL
    FROM
        (
          SELECT D = DATEADD(MONTH, XM.RN, @StartDate)
          FROM 
          (
            SELECT TOP (DATEDIFF(MONTH, @StartDate, @CutoffDate)) 
              RN = ROW_NUMBER() OVER (ORDER BY AO.[object_id])
            FROM sys.all_objects AS AO
            CROSS JOIN sys.all_objects AS AO2
            -- on my system this would support > 5 million days
            ORDER BY AO.[object_id]
          ) AS XM
        ) AS XY
    --ORDER BY LASTOFMONTH ASC
    ) AS BASE
    PIVOT
    (
        MAX(FIRSTOFMONTH) FOR ID IN ([12],[11],[10],[9],[8],[7],[6],[5],[4],[3],[2],[1])
    ) AS PVT

返回：

ENTITY_VAL  12         11         10         9          8          7          6          5          4          3          2          1
----------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
1111111     2016-11-01 2016-12-01 2017-01-01 2017-02-01 2017-03-01 2017-04-01 2017-05-01 2017-06-01 2017-07-01 2017-08-01 2017-09-01 2017-10-01

SQL中的PIVOT返回可能不需要的行为NULL

1 个答案: