34,575
社区成员
发帖
与我相关
我的任务
分享
select a.A,a.B,stuff((select ','+cast(b.C as varchar(10)) from tb as b where a.A = b.A and a.B = b.B for xml path('')),1,1,'') as res
from tb as a
group by a.A,a.B
order by A,B desc
create table tb
(
A int,
B int,
C int
)
insert into tb
select 1001, 1, 75
union all
select 1001, 0, 45
union all
select 1001, 1, 55
union all
select 1001, 0, 65
union all
select 1002, 1, 75
union all
select 1002, 1, 55
union all
select 1002, 0, 45
union all
select 1002, 0, 35
union all
select 1003, 1, 25
union all
select 1003, 1, 65
union all
select 1003, 1, 85
union all
select 1003, 0, 12
union all
select 1003, 0, 22
union all
select 1004, 1, 23
union all
select 1004, 0, 65
go
create function dbo.f_str(@a int , @b int) returns varchar(1000)
as
begin
declare @str varchar(1000)
select @str = isnull(@str + ',' , '') + cast(c as varchar) from tb where a = @a and b = @b
return @str
end
go
--调用函数
select a , b , c = dbo.f_str(a , b) from tb group by a , b
drop function dbo.f_str
drop table tb
/*
a b c
----------- ----------- ----------
1001 0 45,65
1001 1 75,55
1002 0 45,35
1002 1 75,55
1003 0 12,22
1003 1 25,65,85
1004 0 65
1004 1 23
(所影响的行数为 8 行)
*/
create table tb
(
A int,
B int,
C int
)
insert into tb
select 1001, 1, 75
union all
select 1001, 0, 45
union all
select 1001, 1, 55
union all
select 1001, 0, 65
union all
select 1002, 1, 75
union all
select 1002, 1, 55
union all
select 1002, 0, 45
union all
select 1002, 0, 35
union all
select 1003, 1, 25
union all
select 1003, 1, 65
union all
select 1003, 1, 85
union all
select 1003, 0, 12
union all
select 1003, 0, 22
union all
select 1004, 1, 23
union all
select 1004, 0, 65
go
select a , b, c = stuff((select ',' + cast(c as varchar) from tb t where a = tb.a and b = tb.b for xml path('')) , 1 , 1 , '')
from tb
group by a , b
drop table tb
/*
a b c
----------- ----------- ----------
1001 0 45,65
1001 1 75,55
1002 0 45,35
1002 1 75,55
1003 0 12,22
1003 1 25,65,85
1004 0 65
1004 1 23
(8 行受影响)
*/
/*
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')
go
create 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 id
drop 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')
go
select id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '')
from tb
group 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')
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_cursor
select * from @t
drop table tb
if object_id('tb') >0
drop table tb
create table tb
(
A int,
B int,
C int
)
insert into tb
select 1001, 1, 75
union all
select 1001, 0, 45
union all
select 1001, 1, 55
union all
select 1001, 0, 65
union all
select 1002, 1, 75
union all
select 1002, 1, 55
union all
select 1002, 0, 45
union all
select 1002, 0, 35
union all
select 1003, 1, 25
union all
select 1003, 1, 65
union all
select 1003, 1, 85
union all
select 1003, 0, 12
union all
select 1003, 0, 22
union all
select 1004, 1, 23
union all
select 1004, 0, 65
select a.A,a.B,stuff((select ','+cast(b.C as varchar(10)) from tb as b where a.A = b.A and a.B = b.B for xml path('')),1,1,'') as res
from tb as a
group by a.A,a.B
--结果
1001 0 45,65
1001 1 75,55
1002 0 45,35
1002 1 75,55
1003 0 12,22
1003 1 25,65,85
1004 0 65
1004 1 23