数据结构,
id varchar(50)
sname varchar(50)
sgroup varchar(50)数据
id sname sgroup
0001 name1 group1
0002 name2 group1
0003 name3 group1
0004 name4 group1
0005 name5 group2
0006 name6 group2
0007 name7 group3
0008 name8 group4
-----------------------------要求查询结果
id sname sgroup
同组的,也就是sgroup相同的,sname的结果为所有sname的组合,比如:name1+‘|’+name2+‘|’+name3+‘|’+name4
结果显示:
id sname sgroup-----------------------------------------------------------------------------
0001 name1+‘|’+name2+‘|’+name3+‘|’+name4 group1
0005 name5+'|'+name6 group2
0007 name7 group3
0008 name8 group4
id varchar(50)
sname varchar(50)
sgroup varchar(50)数据
id sname sgroup
0001 name1 group1
0002 name2 group1
0003 name3 group1
0004 name4 group1
0005 name5 group2
0006 name6 group2
0007 name7 group3
0008 name8 group4
-----------------------------要求查询结果
id sname sgroup
同组的,也就是sgroup相同的,sname的结果为所有sname的组合,比如:name1+‘|’+name2+‘|’+name3+‘|’+name4
结果显示:
id sname sgroup-----------------------------------------------------------------------------
0001 name1+‘|’+name2+‘|’+name3+‘|’+name4 group1
0005 name5+'|'+name6 group2
0007 name7 group3
0008 name8 group4
oracle的语句貌似我也给你了.两个数据库不同,不可能有相同的语句.
标题:按某字段合并字符串之一(简单合并)
作者:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开)
时间:2008-11-06
地点:广东深圳描述:将如下形式的数据按id字段合并value字段。
id value
----- ------
1 aa
1 bb
2 aaa
2 bbb
2 ccc
需要得到结果:
id value
------ -----------
1 aa,bb
2 aaa,bbb,ccc
即:group by id, 求 value 的和(字符串相加)
*/
--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')
gocreate function dbo.f_str(@id varchar(10)) returns varchar(1000)
as
begin
declare @str varchar(1000)
select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id
return @str
end
go--调用函数
select id , value = dbo.f_str(id) from tb group by iddrop function dbo.f_str
drop 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')
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
--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')
go
declare @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 for
select id , value from tb
declare @id_old int , @id int , @value varchar(10) , @s varchar(100)
open my_cursor
fetch my_cursor into @id , @value
select @id_old = @id , @s=''
while @@FETCH_STATUS = 0
begin
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_cursorselect * from @t
drop table tb
标题:合并相同列的数据
作者:爱新觉罗.毓华
时间:2008-05-05
地点:广东深圳
*//*情况说明
NAME USERID
张三 KB001
张三 KB003
李四 KB001
李四 KB002
李四 KB003用SQL实现表示如下:
NAME USERID
张三 KB001,KB003
李四 KB001,KB002,KB003
*/create table tb(NAME varchar2(10) , USERID varchar2(10))
insert into tb values('张三' , 'KB001');
insert into tb values('张三' , 'KB003');
insert into tb values('李四' , 'KB001');
insert into tb values('李四' , 'KB002');
insert into tb values('李四' , 'KB003');--1
select name,rtrim(
max(decode(USERID , 'KB001' , USERID || ',' , '')) ||
max(decode(USERID , 'KB002' , USERID || ',' , '')) ||
max(decode(USERID , 'KB003' , USERID || ',' , '')),',') userid
from tb
group by name--2
SELECT NAME, ltrim(MAX(sys_connect_by_path(userid , ',')) , ',') userid
FROM (SELECT NAME , userid , row_number() over(PARTITION BY NAME ORDER BY userid) rn , rownum prn FROM tb)
START WITH rn = 1
CONNECT BY prn - 1 = PRIOR prn AND NAME = PRIOR NAME
GROUP BY NAME
ORDER BY NAME;drop table tb/*
NAME USERID
---------- ---------------------------------
李四 KB001,KB002,KB003
张三 KB001,KB003
2 rows selected
*/