111.特殊的交叉报表处理-案例

Bertha 。 2024-02-19 19:00 42阅读 0赞

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
    --*/