CREATE TABLE tb(col1 varchar(10),col2 int) INSERT tb SELECT 'a',1 UNION ALL SELECT 'a',2 UNION ALL SELECT 'b',1 UNION ALL SELECT 'b',2 UNION ALL SELECT 'b',3 GO--合并处理函数 CREATE FUNCTION dbo.f_str(@col1 varchar(10)) RETURNS varchar(100) AS BEGIN DECLARE @re varchar(100) SET @re='' SELECT @re=@re+','+CAST(col2 as varchar) FROM tb WHERE col1=@col1 RETURN(STUFF(@re,1,1,'')) END GO--调用函数 SELECT col1,col2=dbo.f_str(col1) FROM tb GROUP BY col1 --删除测试 DROP TABLE tb DROP FUNCTION f_str /*--结果 col1 col2 ---------- ----------- a 1,2 b 1,2,3 --*/
有没有一条语句就能搞定,比如说用到stuff()函数
CREATE TABLE tb(col1 varchar(10),col2 int) INSERT tb SELECT 'a',1 UNION ALL SELECT 'a',2 UNION ALL SELECT 'b',1 UNION ALL SELECT 'b',2 UNION ALL SELECT 'b',3 UNION ALL SELECT 'c',3--合并处理 SELECT col1, col2=CAST(MIN(col2) as varchar) +CASE WHEN COUNT(*)=3 THEN ',' +CAST((SELECT col2 FROM tb WHERE col1=a.col1 AND col2 NOT IN(MAX(a.col2),MIN(a.col2))) as varchar) ELSE '' END +CASE WHEN COUNT(*)>=2 THEN ','+CAST(MAX(col2) as varchar) ELSE '' END FROM tb a GROUP BY col1
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
GO--合并处理函数
CREATE FUNCTION dbo.f_str(@col1 varchar(10))
RETURNS varchar(100)
AS
BEGIN
DECLARE @re varchar(100)
SET @re=''
SELECT @re=@re+','+CAST(col2 as varchar)
FROM tb
WHERE col1=@col1
RETURN(STUFF(@re,1,1,''))
END
GO--调用函数
SELECT col1,col2=dbo.f_str(col1) FROM tb GROUP BY col1
--删除测试
DROP TABLE tb
DROP FUNCTION f_str
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
UNION ALL SELECT 'c',3--合并处理
SELECT col1,
col2=CAST(MIN(col2) as varchar)
+CASE
WHEN COUNT(*)=3 THEN ','
+CAST((SELECT col2 FROM tb WHERE col1=a.col1 AND col2 NOT IN(MAX(a.col2),MIN(a.col2))) as varchar)
ELSE ''
END
+CASE
WHEN COUNT(*)>=2 THEN ','+CAST(MAX(col2) as varchar)
ELSE ''
END
FROM tb a
GROUP BY col1