SQL Server - 同一列上的多个 PIVOT

Question

我很想知道我是否可以在 sql server 中的同一列上执行多个 PIVOT，如下所示:

WITH T(ID, NAME, MSNAME, PLANED, ACTUAL)
AS (
    SELECT 1, '45rpm', 'Raised to Supplier', '2014-12-17', '2015-12-17' UNION ALL
    SELECT 1, '45rpm', 'Base Test Date', '2014-12-18', '2015-12-18' UNION ALL
    SELECT 1, '45rpm', 'Washing Approval', '2014-12-19', '2015-12-19'
)
SELECT ID, NAME
  , MAX(CASE WHEN MSNAME LIKE 'Raised to Supplier' THEN PLANED END) AS 'Raised to Supplier (PLANED)'
  , MAX(CASE WHEN MSNAME LIKE 'Base Test Date' THEN PLANED END) AS 'Base Test Date (PLANED)'
  , MAX(CASE WHEN MSNAME LIKE 'Washing Approval' THEN PLANED END) AS 'Washing Approval (PLANED)'
  , MAX(CASE WHEN MSNAME LIKE 'Raised to Supplier' THEN ACTUAL END) AS 'Raised to Supplier (ACTUAL)'
  , MAX(CASE WHEN MSNAME LIKE 'Base Test Date' THEN ACTUAL END) AS 'Base Test Date (ACTUAL)'
  , MAX(CASE WHEN MSNAME LIKE 'Washing Approval' THEN ACTUAL END) AS 'Washing Approval (ACTUAL)'
FROM T
GROUP BY ID, NAME

对于列PLANED，它运行良好，但我无法添加第二列ACTUAL(如上面的示例所示↑)

WITH T(ID, NAME, MSNAME, PLANED, ACTUAL)
AS (
    SELECT 1, '45rpm', 'Raised to Supplier', '2014-12-17', '2015-12-17' UNION ALL
    SELECT 1, '45rpm', 'Base Test Date', '2014-12-18', '2015-12-18' UNION ALL
    SELECT 1, '45rpm', 'Washing Approval', '2014-12-19', '2015-12-19'
)
SELECT ID, NAME
  , MAX([Raised to Supplier]) AS 'Raised to Supplier (PLANED)'
  , MAX([Base Test Date]) AS 'Base Test Date (PLANED)'
  , MAX([Washing Approval]) AS 'Washing Approval (PLANED)' FROM T
PIVOT
(
    max(PLANED)
    FOR MSNAME IN ([Raised to Supplier],[Base Test Date],[Washing Approval])
) AS p1
GROUP BY ID, NAME

编辑:

PIVOT 关键字有一些限制，其中之一已在此处讨论，即 SQL-server 不支持 PIVOT 中的多重聚合 - 由 Giorgos 评论 [类似 PIVOT (min(), max(), sum() ...)]

有 3 种替代方案可以应对这种情况:

1. 使用不带 PIVOT 关键字的 case 语句的一般解决方案(如上面第一个示例所示)
2. 首先对数据进行反透视，然后进行透视(在聚合之前增加行并合并列)[由 @bluefeet 回答]
3. 复制第二次聚合的列[由 @NoDisplayName 回答]

了解后，我认为这个问题的标题应该是:单个 PIVOT() 中的多个聚合，而不是现有的聚合

Answer 1

要透视多列，您需要使用多个透视而不是多个聚合。试试这个。

SELECT ID,
       NAME,
       Max([Raised to Supplier(PLANED)])[Raised to Supplier(PLANED)],
       Max([Base Test Date(PLANED)])[Base Test Date(PLANED)],
       Max([Washing Approval(PLANED)])[Washing Approval(PLANED)],
       Max([Raised to Supplier(ACTUAL)])[Raised to Supplier(ACTUAL)],
       Max([Base Test Date(ACTUAL)])[Base Test Date(ACTUAL)],
       Max([Washing Approval(ACTUAL)])[Washing Approval(ACTUAL)]
FROM   (SELECT 1 ID,'45rpm' NAME,'Raised to Supplier' + '(PLANED)' MSNAME_pl,'Raised to Supplier' + '(ACTUAL)' MSNAME_ac,'2014-12-17' PLANED,'2015-12-17' ACTUAL
        UNION ALL
        SELECT 1,'45rpm','Base Test Date' + '(PLANED)','Base Test Date' + '(ACTUAL)','2014-12-18','2015-12-18'
        UNION ALL
        SELECT 1,'45rpm','Washing Approval' + '(PLANED)','Washing Approval' + '(ACTUAL)','2014-12-19','2015-12-19') a
       PIVOT ( Max(PLANED)
             FOR MSNAME_pl IN ([Raised to Supplier(PLANED)],
                               [Base Test Date(PLANED)],
                               [Washing Approval(PLANED)]) ) AS p1 

        PIVOT ( MAX(ACTUAL) 
              FOR MSNAME_ac IN ([Raised to Supplier(ACTUAL)],
                                [Base Test Date(ACTUAL)],
                                [Washing Approval(ACTUAL)])) p2
GROUP BY ID, NAME