分组字符合并SQL语句 按某字段合并字符串之一(简单合并)

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')gocreate function dbo.f_str(@id int) returns varchar(100)asbegin declare @str varchar(1000) set @str='' select @str=@str+''+cast(value as varchar) from tb where id = @id set @str=right(@str , len(@str) - 1) return @strendgo--调用函数select id , value = dbo.f_str(id) from tb group by iddrop function dbo.f_strdrop table tb

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')goselect id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '')from tb group by iddrop table tb

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_cursor fetch 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 , @value END  insert @t values(@id_old , stuff(@s,1,1,'')) close my_cursor deallocate my_cursor select * from @tdrop table tb