1.sql2000中只能用自定义的函数解决

create table tb(id int, value varchar(10))insert into tb values(1, 'aa')insert into tb values(1, 'bb')insert into tb values(2, 'aaa')insert into tb values(2, 'bbb')insert into tb values(2, 'ccc')go create function dbo.f_str(@id varchar(10)) returns varchar(1000)asbegin  declare @str varchar(1000)  select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id  return @strendgo --调用函数select id , value = dbo.f_str(id) from tb group by id drop function dbo.f_strdrop table tb

 

 

2、sql2005中的方法

create table tb(id int, value varchar(10))insert into tb values(1, 'aa')insert into tb values(1, 'bb')insert into tb values(2, 'aaa')insert into tb values(2, 'bbb')insert into tb values(2, 'ccc')go select id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '')from tbgroup by id drop table tb

 

 

 

3、使用游标合并数据

create table tb(id int, value varchar(10))insert into tb values(1, 'aa')insert into tb values(1, 'bb')insert into tb values(2, 'aaa')insert into tb values(2, 'bbb')insert into tb values(2, 'ccc')godeclare @t table(id int,value varchar(100))--定义结果集表变量--定义游标并进行合并处理declare my_cursor cursor local forselect id , value from tbdeclare @id_old int , @id int , @value varchar(10) , @s varchar(100)open my_cursorfetch my_cursor into @id , @valueselect @id_old = @id , @s=''while @@FETCH_STATUS = 0begin    if @id = @id_old       select @s = @s + ',' + cast(@value as varchar)    else      begin        insert @t values(@id_old , stuff(@s,1,1,''))        select @s = ',' + cast(@value as varchar) , @id_old = @id      end    fetch my_cursor into @id , @valueENDinsert @t values(@id_old , stuff(@s,1,1,''))close my_cursordeallocate my_cursor select * from @tdrop table tb