內容引自：
多行一列數據合并成一行一列數據
http://topic.csdn.net/u/20090714/17/5FE6A0F7-CE78-4936-BE31-21D462236059.html
在MySQL和Oracle中實現行合并
http://www.tkk7.com/rain1102/archive/2009/06/24/283867.html
SQL Server
--SQL2005中的方法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
MySQL
select name , group_concat(email order by email separator ", ") as email from student group by name
Oracle
如果以上效果想在Oracle中顯示, 則比較復雜點了, 因為Oracle中沒有行合并函數, 則需要使用sys_connect_by_path()來實現, 代碼如下:
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
posted on 2010-04-09 16:24
黃小二 閱讀(1715)
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