---------------------------------------------------------------- -- Author :SQL77(只为思齐老) -- Date :2010-01-07 09:39:16 -- Version: -- Microsoft SQL Server 2000 - 8.00.194 (Intel X86) -- Aug 6 2000 00:57:48 -- Copyright (c) 1988-2000 Microsoft Corporation -- Desktop Engine on Windows NT 5.1 (Build 2600: Service Pack 3) -- ---------------------------------------------------------------- --> 测试数据:[TB] if object_id('[TB]') is not null drop table [TB] go create table [TB]([col1] int,[col2] int,[col3] int) insert [TB] select 4,6,11111 union all select 5,6,11111 union all select 4,7,2222 union all select 5,7,2222 --------------开始查询-------------------------- CREATE FUNCTION GET_STRINGcol2(@col1 int) RETURNS VARCHAR(50) AS BEGIN DECLARE @CLASS VARCHAR(50) SELECT @CLASS=ISNULL(@CLASS+',','')+LTRIM(col2) FROM TB WHERE col1=@col1 RETURN @CLASS ENDCREATE FUNCTION GET_STRINGcol3(@col1 int) RETURNS VARCHAR(50) AS BEGIN DECLARE @CLASS VARCHAR(50) SELECT @CLASS=ISNULL(@CLASS+',','')+LTRIM(col3) FROM TB WHERE col1=@col1 RETURN @CLASS END SELECT COL1,DBO.GET_STRINGcol2(COL1)COL2,DBO.GET_STRINGcol3(COL1)COL3 FROM TB GROUP BY COL1 ----------------结果---------------------------- /* COL1 COL2 COL3 ----------- -------------------------------------------------- -------------------------------------------------- 4 6,7 11111,2222 5 6,7 11111,2222(所影响的行数为 2 行) */DROP FUNCTION GET_STRINGcol2,GET_STRINGcol3参考
--sql 2000用如下函数实现. create table tb(id int,gradeId int,classId int) insert into tb values(1 , 20 , 2 ) insert into tb values(2 , 20 , 3 ) insert into tb values(3 , 21 , 4 ) insert into tb values(4 , 21 , 5 ) gocreate function dbo.f_str1(@gradeId int) returns varchar(100) as begin declare @str varchar(1000) set @str = '' select @str = @str + ',' + cast(id as varchar) from tb where gradeId = @gradeId set @str = right(@str , len(@str) - 1) return @str end go create function dbo.f_str2(@gradeId int) returns varchar(100) as begin declare @str varchar(1000) set @str = '' select @str = @str + ',' + cast(classId as varchar) from tb where gradeId = @gradeId set @str = right(@str , len(@str) - 1) return @str end go --调用函数 select id = dbo.f_str1(gradeId) , gradeId , classId = dbo.f_str2(gradeId) from tb group by gradeIddrop function dbo.f_str1,dbo.f_str2 drop table tb/* id gradeId classId ---------------------------------------------------------------------------------------------------- ----------- ---------------------------------------------------------------------------------------------------- 1,2 20 2,3 3,4 21 4,5(所影响的行数为 2 行)*/--sql 2005见下: /* 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 int) returns varchar(100) as begin 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 @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
-- Author :SQL77(只为思齐老)
-- Date :2010-01-07 09:39:16
-- Version:
-- Microsoft SQL Server 2000 - 8.00.194 (Intel X86)
-- Aug 6 2000 00:57:48
-- Copyright (c) 1988-2000 Microsoft Corporation
-- Desktop Engine on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据:[TB]
if object_id('[TB]') is not null drop table [TB]
go
create table [TB]([col1] int,[col2] int,[col3] int)
insert [TB]
select 4,6,11111 union all
select 5,6,11111 union all
select 4,7,2222 union all
select 5,7,2222
--------------开始查询--------------------------
CREATE FUNCTION GET_STRINGcol2(@col1 int)
RETURNS VARCHAR(50)
AS
BEGIN
DECLARE @CLASS VARCHAR(50)
SELECT @CLASS=ISNULL(@CLASS+',','')+LTRIM(col2) FROM TB WHERE col1=@col1
RETURN @CLASS
ENDCREATE FUNCTION GET_STRINGcol3(@col1 int)
RETURNS VARCHAR(50)
AS
BEGIN
DECLARE @CLASS VARCHAR(50)
SELECT @CLASS=ISNULL(@CLASS+',','')+LTRIM(col3) FROM TB WHERE col1=@col1
RETURN @CLASS
END
SELECT COL1,DBO.GET_STRINGcol2(COL1)COL2,DBO.GET_STRINGcol3(COL1)COL3 FROM TB GROUP BY COL1
----------------结果----------------------------
/*
COL1 COL2 COL3
----------- -------------------------------------------------- --------------------------------------------------
4 6,7 11111,2222
5 6,7 11111,2222(所影响的行数为 2 行)
*/DROP FUNCTION GET_STRINGcol2,GET_STRINGcol3参考
create table tb(id int,gradeId int,classId int)
insert into tb values(1 , 20 , 2 )
insert into tb values(2 , 20 , 3 )
insert into tb values(3 , 21 , 4 )
insert into tb values(4 , 21 , 5 )
gocreate function dbo.f_str1(@gradeId int) returns varchar(100)
as
begin
declare @str varchar(1000)
set @str = ''
select @str = @str + ',' + cast(id as varchar) from tb where gradeId = @gradeId
set @str = right(@str , len(@str) - 1)
return @str
end
go
create function dbo.f_str2(@gradeId int) returns varchar(100)
as
begin
declare @str varchar(1000)
set @str = ''
select @str = @str + ',' + cast(classId as varchar) from tb where gradeId = @gradeId
set @str = right(@str , len(@str) - 1)
return @str
end
go
--调用函数
select id = dbo.f_str1(gradeId) , gradeId , classId = dbo.f_str2(gradeId) from tb group by gradeIddrop function dbo.f_str1,dbo.f_str2
drop table tb/*
id gradeId classId
---------------------------------------------------------------------------------------------------- ----------- ----------------------------------------------------------------------------------------------------
1,2 20 2,3
3,4 21 4,5(所影响的行数为 2 行)*/--sql 2005见下:
/*
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 int) returns varchar(100)
as
begin
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 @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