鍦∕ySQL鍜孫racle涓疄鐜拌鍚堝茍
http://www.tkk7.com/rain1102/archive/2009/06/24/283867.html
SQL Server
--SQL2005涓殑鏂規硶2
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, [values]=stuff((select ','+[value] from tb t where id=tb.id
for xml path('')), 1, 1, '')
from tb
group by id
/*
id values
----------- --------------------
1 aa,bb
2 aaa,bbb,ccc
(2 row(s) affected)
*/
drop 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')
go
select id, [values]=stuff((select ','+[value] from tb t where id=tb.id
for xml path('')), 1, 1, '')
from tb
group by id
/*
id values
----------- --------------------
1 aa,bb
2 aaa,bbb,ccc
(2 row(s) affected)
*/
drop table tb
MySQL
select name , group_concat(email order by email separator ", ") as email from student group by name
Oracle
濡傛灉浠ヤ笂鏁堟灉鎯沖湪Oracle涓樉紺? 鍒欐瘮杈冨鏉傜偣浜? 鍥犱負Oracle涓病鏈夎鍚堝茍鍑芥暟, 鍒欓渶瑕佷嬌鐢╯ys_connect_by_path()鏉ュ疄鐜? 浠ｇ爜濡備笅:
select name, ltrim(sys_connect_by_path(email,','),',') email from(
select name,email,
row_number() over(partition by name order by email) rn,
count(*) over(partition by name) cnt
from student
) where level = cnt
start with rn = 1
connect by prior name = name and prior rn + 1 = rn
select name, ltrim(sys_connect_by_path(email,','),',') email from(
select name,email,
row_number() over(partition by name order by email) rn,
count(*) over(partition by name) cnt
from student
) where level = cnt
start with rn = 1
connect by prior name = name and prior rn + 1 = rn
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濡傛灉榪滅▼涓繪満鐗堟湰鏄?6.0.3
鑰岄」鐩紩鐢ㄧ殑鏄?5.0.3
鍒欎細鍑虹幇浠ヤ笂鐨勯敊璇彁紺?/p>
浣嗘槸濡傛灉鏈満涓繪満涓婄増鏈槸 6.0.3
鍗充嬌欏圭洰寮曠敤鐨勬槸 5.0.3
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SQL緙栫爜瑙勮寖(鏀墮泦) http://hi.baidu.com/rambochow/blog/item/3ebcbb3db3758903bba16743.html
1.涔﹀啓鏍煎紡 
7.瀵規暟鎹簱琛ㄦ搷浣滅殑鐗規畩瑕佹眰銆