115.动态分组处理-案例INSERT @t SELECT @pid+'b.a OR b.GROUP BY b.ID,b

CREATE TABLE tb(ID int,Num int)
INSERT tb SELECT 1,2
UNION ALL ALL SELECT 6,2
UNION ALL SELECT 7,1
UNION ALL SELECT 8,5
UNION ALL SELECT 9,1
GO

--查询的存储过程
CREATE PROC p_Qry
@group VARCHAR(1000)
AS
SET NOCOUNT ON
IF @group LIKE '%[^0-9,]%'
BEGIN
	RAISERROR(N'"%s" 中包含非数字数据',1,16,@group)
	RETURN
END
--将字符串分拆为分组表
DECLARE @t TABLE(ID int IDENTITY,Groups varchar(10),a int,b int)
DECLARE @i int,@pid varchar(10)
SELECT @i=CHARINDEX(',',@group+',')
	 ,@pid=LEFT(@group,@i-1)
	 ,@group=STUFF(@group,1,@i,'')+','
	 ,@i=CHARINDEX(',',@group)
INSERT @t SELECT 'ID<='+@pid,NULL,@pid
WHILE @i>1
BEGIN
	INSERT @t SELECT @pid+'b.a OR b.a IS NULL)
GROUP BY b.ID,b.Groups
ORDER BY b.ID
GO

--调用存储过程进行查询
EXEC p_Qry '2,3,6'
/*--测试结果
Groups     Num         
---------- ----------- 
ID<=2      5
26       7
--*/