特殊的交叉报表处理示例.sql

CREATE TABLE tb(Item varchar(10),Color varchar(10),Quantity int)
INSERT tb SELECT 'Table','Blue', 124
UNION ALL SELECT 'Table','Red',   60
UNION ALL SELECT 'Table','Red',   99
UNION ALL SELECT 'Table','Green', 120
UNION ALL SELECT 'Table','Green', 110
UNION ALL SELECT 'Chair','Yellow',101
UNION ALL SELECT 'Chair','Yellow',131
UNION ALL SELECT 'Chair','Red',   90
UNION ALL SELECT 'Chair','White', 55
GO

--生成分组信息临时表
SELECT Item,Color,id=0
INTO # FROM tb
GROUP BY Item,Color
--生成各组Item的Color序号
DECLARE @Item varchar(10),@i varchar(10)
UPDATE # SET
   @i=CASE WHEN @Item=Item THEN @i+1 ELSE 1 END,
   id=@i,@Item=Item

--生成交叉数据报表处理语句
DECLARE @s1 nvarchar(4000),@s2 nvarchar(4000),@fd nvarchar(4000)
SELECT @s1='',@s2='',@fd='',@i=MAX(id)
FROM #
GROUP BY Item
WHILE @i>0
   SELECT
       @fd=','+QUOTENAME('col'+@i)+'='+QUOTENAME(@i)+@fd,
       @s1=@s1+','+QUOTENAME(@i)
           +'=MAX(CASE id WHEN '+@i
           +' THEN Color END)',
       @s2=@s2+','+QUOTENAME(@i)
           +'=CAST(SUM(CASE b.id WHEN '+@i
           +' THEN a.Quantity END) as varchar)',
       @i=@i-1
EXEC('
SELECT Item=Item'+@fd+' FROM(
   SELECT Item'+@s1+',s=0 FROM # GROUP BY Item
   UNION ALL
   SELECT a.Item'+@s2+',s=1
   FROM tb a,# b
   WHERE a.Item=b.Item AND a.Color=b.Color
   GROUP BY a.Item
)a ORDER BY Item,s')
DROP TABLE #
/*--结果
Item       col0         col1         col2
------------- ------------------- ----------------- ---------------
Chair      Red         White       Yellow
Chair      90          55          232
Table      Blue        Green       Red
Table      124         230         159
--*/

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