Question

我正在努力使用SQL从表中转换下面的数据：

company name    01/05/15    24/04/15    17/04/15    10/04/150    3/04/15
companyA        Stage 2     Stage 1 
companyB        Stage 2     Stage 1 
companyC        Stage 3     Stage 2     Stage 1

采用以下格式：

company name    Stage 1     Stage 2     Stage 3
companyA        10/04/15    01/05/15    
companyB        17/04/15    01/05/15    
companyC        03/04/15    24/04/15    01/05/15

我尝试了Pivot，但似乎无效。

Answer 1

首先UNPIVOT然后PIVOT：

，您可以通过以下方式执行此操作

DECLARE @t TABLE
    (
      c VARCHAR(20) ,
      [01/05/15] VARCHAR(20) ,
      [24/04/15] VARCHAR(20) ,
      [17/04/15] VARCHAR(20) ,
      [10/04/150] VARCHAR(20) ,
      [3/04/15] VARCHAR(20)
    )

INSERT  INTO @t
VALUES  ( 'Company A', 'Stage 2', 'Stage 1', NULL, NULL, NULL ),
        ( 'Company B', 'Stage 2', 'Stage 1', NULL, NULL, NULL ),
        ( 'Company C', 'Stage 3', 'Stage 2', 'Stage 1', NULL, NULL )    


SELECT * FROM @t        
UNPIVOT (a FOR b IN([01/05/15], [24/04/15], [17/04/15], [10/04/150], [3/04/15])) u
PIVOT (MAX(b) FOR a in([Stage 1],[Stage 2],[Stage 3])) p

输出：

c           Stage 1     Stage 2     Stage 3
Company A   24/04/15    01/05/15    NULL
Company B   24/04/15    01/05/15    NULL
Company C   17/04/15    24/04/15    01/05/15

使用SQL将表数据转换为列

1 个答案: