行值动态变化的交叉报表处理示例.sql

CREATE TABLE tb(Year int,Quarter int,Quantity decimal(10,1),Price decimal(10,2))
INSERT tb SELECT 1990, 1, 1.1, 2.5
UNION ALL SELECT 1990, 1, 1.2, 3.0
UNION ALL SELECT 1990, 2, 1.2, 3.0
UNION ALL SELECT 1990, 1, 1.3, 3.5
UNION ALL SELECT 1990, 2, 1.4, 4.0
UNION ALL SELECT 1991, 1, 2.1, 4.5
UNION ALL SELECT 1991, 2, 2.1, 4.5
UNION ALL SELECT 1991, 2, 2.2, 5.0
UNION ALL SELECT 1991, 1, 2.3, 5.5
UNION ALL SELECT 1991, 1, 2.4, 6.0

--查询处理
DECLARE @s nvarchar(4000)
--交叉报表处理代码头
SET @s='SELECT Year'
--生成列记录水平显示的处理代码拼接
SELECT @s=@s
        +','+QUOTENAME(N'Q'+CAST(Quarter as varchar)+N'_Amount')
        +N'=SUM(CASE Quarter WHEN '+CAST(Quarter as varchar)
        +N' THEN Quantity END)'
        +','+QUOTENAME(N'Q'+CAST(Quarter as varchar)+N'_Price')
        +N'=CAST(AVG(CASE Quarter WHEN '+CAST(Quarter as varchar)
        +N' THEN Price END)AS DECIMAL(10,2))'
        +','+QUOTENAME(N'Q'+CAST(Quarter as varchar)+N'_Money')
        +N'=CAST(SUM(CASE Quarter WHEN '+CAST(Quarter as varchar)
        +N' THEN Quantity*Price END)AS DECIMAL(10,2))'
FROM tb
GROUP BY Quarter
--拼接交叉报表处理尾部,并且执行拼接后的动态SQL语句
EXEC(@s+N'
FROM tb
GROUP BY Year')
/*--结果
Year  Q1_Amount  Q1_Price   Q1_Money  Q2_Amount  Q2_Price  Q2_Money
------- ----------------- --------------- ----------------- ----------------- -------------- ----------------
1990  3.6         3.00       10.90       2.6          3.50      9.20
1991  6.8         5.33       36.50       4.3          4.75      20.45
--*/