Question

嗯，有很多关于pivot SQL的参考资料。但是，我仍然无法解决我的问题。

我有下表：

-----------------------------------------------------------------------
InspectYear     PartNo    PartDesc    A       B      C     D
-----------------------------------------------------------------------
2015            001       Part 1      9       8      8     6
2015            002       Part 2      8       8      8     6
2014            001       Part 1      9       2      8     6
2014            002       Part 2      8       8      8     4

我想通过动态＆＃34; InspectYear＆＃34;得到以下结果：

-----------------------------------------------------------------------
PartNo    PartDesc  NewCol        2014    2015
-----------------------------------------------------------------------
001       Part 1    A             9       9
001       Part 1    B             2       8
001       Part 1    C             8       8
001       Part 1    D             6       6
002       Part 2    A             8       8
002       Part 2    B             8       8
002       Part 2    C             8       8
002       Part 2    D             4       6

有没有人知道透视查询？
真的很感激。

Answer 1

尝试以下动态PIVOT：

DECLARE @InspectYear AS NVARCHAR(MAX),@Query  AS NVARCHAR(MAX);

SET @InspectYear = STUFF((SELECT distinct ',' + QUOTENAME(InspectYear) 
            FROM table4 c
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

SET @Query = 
';WITH data AS
(
    SELECT InspectYear, PartNo, PartDesc, NewCol, number
    FROM table4
    UNPIVOT
    (
      number
      FOR NewCol IN (A, B, C,D)
    ) AS unpvt
)
SELECT *
FROM data
PIVOT
(
    SUM(number)
    FOR InspectYear IN ( '+@InspectYear+' )
) AS pvt
ORDER BY PartNo, PartDesc, NewCol '

EXECUTE(@query)

注意：请参阅@doraemon创建表并插入数据语句

Answer 2

您必须UNPIVOT您的初始数据，然后再PIVOT。

这是我找到的解决方案。看看这是否符合您的要求。

CREATE TABLE table4
(
    InspectYear INT,
    PartNo VARCHAR(5),
    PartDesc VARCHAR(30),
    A INT,
    B INT,
    C INT,
    D INT
)

INSERT INTO table4 VALUES
(2015, '001', 'Part 1', 9, 8, 8, 6),
(2015, '002', 'Part 2', 8, 8, 8, 6),
(2014, '001', 'Part 1', 9, 2, 8, 6),
(2014, '002', 'Part 2', 8, 8, 8, 4)

;WITH data AS
(
    SELECT InspectYear, PartNo, PartDesc, NewCol, number
    FROM table4
    UNPIVOT
    (
      number
      FOR NewCol IN (A, B, C,D)
    ) AS unpvt
)
SELECT *
FROM data
PIVOT
(
    SUM(number)
    FOR InspectYear IN ( [2014], [2015] )
) AS pvt
ORDER BY PartNo, PartDesc, NewCol

请试一试。谢谢。：）

按年度透视SQL

2 个答案: