如何将SQL Server行数据转换为列?

假设您只拥有所述的产品类型D和E,那么一个简单的自连接就可以满足您的需求。

如果你想要更通用的东西,请扩展你的问题。

DROP TABLE IF EXISTS #Demo

SELECT
    *
INTO
    #Demo
FROM
    (VALUES 
    (11421, 7, 4, 'Excellent More', 'E')
   ,(11421, 7, 15, 'Comprehensive Data', 'D'))  A
    (member_no, cover_version, product_id, product_name, product_type) 

SELECT
    D.member_no
   ,D.cover_version
   ,E.product_id product_e_id
   ,E.product_name product_e_name
   ,D.product_id product_d_id
   ,D.product_name product_d_name
FROM
    #Demo D
JOIN #Demo E ON D.member_no = E.member_no
                AND D.product_type = 'D'
                AND E.product_type = 'E';


member_no   cover_version product_e_id product_e_name     product_d_id product_d_name
----------- ------------- ------------ ------------------ ------------ ------------------
11421       7             4            Excellent More     15           Comprehensive Data

如果您想基于未知的产品类型动态地执行此操作,可以使用此方法。

DECLARE @SQL NVARCHAR(MAX),
        @Columns NVARCHAR(MAX),
        @CaseExpressions NVARCHAR(MAX) = 'MAX(CASE WHEN product_type = ''<<productType>>'' THEN product_id END) AS [product_<<productType>>_id],
                                          MAX(CASE WHEN product_type = ''<<productType>>'' THEN product_name END) AS [product_<<productType>>_name]'

-- build concatenated string with 2 columns for each product_type in your table.
-- group by product_type to get distinct results.
-- replaces <<productType>> with the actual product_type value
SELECT  @Columns = COALESCE(@Columns + ',', '') + REPLACE(@CaseExpressions, '<<productType>>', product_type)
FROM    myTable
GROUP BY product_type

-- build select query
SET     @SQL = 'SELECT  member_no, cover_version,' + @Columns + ' FROM myTable GROUP BY member_no, cover_version'

-- to see what the dynamic sql looks like
PRINT   @SQL 

-- to execute the dynamic sql and see result
EXEC    (@SQL)