将检索出来的列按逗号拼接起来

 1 DECLARE  @tb TABLE(id int, value varchar(10)) 
 2 insert into @tb values(1, 'aa') 
 3 insert into @tb values(1, 'bb') 
 4 insert into @tb values(2, 'aaa') 
 5 insert into @tb values(2, 'bbb') 
 6 insert into @tb values(2, 'ccc') 
 7  
 8 -- 查询处理 
 9 SELECT * FROM(SELECT DISTINCT id FROM @tb) A OUTER APPLY( 
10         SELECT [values]= STUFF(REPLACE(REPLACE( 
11             ( 
12                 SELECT value FROM @tb N 
13                 WHERE id = A.id 
14                 FOR XML AUTO 
15             ), '', ','), '"/>', '') ,1,1,'')
16 ) N

输出

id          values 

----------- ----------- 

1          aa,bb 

2          aaa,bbb,ccc 

SELECT STUFF((SELECT ','+name FROM 表名 for xml path('')),1,1,'')