根据它们的值,在它们自己的列中排

SELECT 
    np.Id, 
    np.Description, 
    MIN(Case promotionalCode WHEN 'A' THEN Price ELSE NULL END) AS 'A',
    MIN(Case promotionalCode WHEN 'B' THEN Price ELSE NULL END) AS 'B',
    MIN(Case promotionalCode WHEN 'C' THEN Price ELSE NULL END) AS 'C'
FROM 
    Price AS p 
INNER JOIN nProduct AS np ON p.nProduct = np.Id
GROUP BY 
    np.Id,
    np.Description

这是一个简单的测试示例:

DECLARE @temp TABLE (
    id INT,
    description varchar(50),
    promotionalCode char(1),
    Price smallmoney
)

INSERT INTO @temp
select 1, 'Product 1', 'A', 5
    union
SELECT 1, 'Product 1',  'B', 4
    union
SELECT 1, 'Product 1', 'C', 2



SELECT
    id,
    description,
    MIN(Case promotionalCode WHEN 'A' THEN Price ELSE NULL END) AS 'A',
    MIN(Case promotionalCode WHEN 'B' THEN Price ELSE NULL END) AS 'B',
    MIN(Case promotionalCode WHEN 'C' THEN Price ELSE NULL END) AS 'C'
FROM
     @temp
GROUP BY 
    id,
    description