我有一个表A,B 数据如下:
A表
AID NAME
1 Tom
2 Jim
B表
BID NUMBER
1 20
1 30
其中AID = BID
我想做一个查询结果
查出两张表的结果为
NAME NUMBER
Tom 20,30
Jim请问这可以做得到吗,我应该怎样做呢,请大家指导我一下,谢谢
A表
AID NAME
1 Tom
2 Jim
B表
BID NUMBER
1 20
1 30
其中AID = BID
我想做一个查询结果
查出两张表的结果为
NAME NUMBER
Tom 20,30
Jim请问这可以做得到吗,我应该怎样做呢,请大家指导我一下,谢谢
合并分拆表:
http://topic.csdn.net/u/20080612/22/c850499f-bce3-4877-82d5-af2357857872.html?23514
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
IF OBJECT_ID('B') IS NOT NULL DROP TABLE B
IF OBJECT_ID('FUN_MU') IS NOT NULL DROP FUNCTION FUN_MU
GO
CREATE TABLE A(
AID INT
,[NAME] VARCHAR(50)
)
INSERT INTO A
SELECT 1 ,'Tom' UNION ALL
SELECT 2 ,'Jim'
CREATE TABLE B(
BID INT
,[NUMBER] VARCHAR(50)
)
INSERT INTO B
SELECT 1 ,'20' UNION ALL
SELECT 1 ,'30'
GO
CREATE FUNCTION FUN_MU(@BID INT)
RETURNS VARCHAR(8000)
AS
BEGIN
DECLARE @STR VARCHAR(8000)
SELECT @STR=ISNULL(@STR+',','')+[NUMBER] FROM B WHERE BID=@BID
RETURN @STR
END
GO
SELECT [NAME],DBO.FUN_MU(BID) FROM B
INNER JOIN A ON B.BID=A.AID
GROUP BY BID,[NAME]
/*
Tom 20,30
*/
insert into a values(1 , 'Tom')
insert into a values(2 , 'Jim')
create table b(BID int, NUMBER int)
insert into b values(1 , 20)
insert into b values(1 , 30)
gocreate function dbo.f_str(@BID int) returns varchar(100)
as
begin
declare @str varchar(1000)
set @str = ''
select @str = @str + ',' + cast(NUMBER as varchar) from b where BID = @BID
set @str = right(@str , len(@str) - 1)
return @str
end
go--调用函数
select a.name , isnull(t.NUMBER , '') NUMBER from a left join
(select BID , NUMBER = dbo.f_str(BID) from b group by BID) t
on a.aid = t.biddrop table a , b
drop function dbo.f_str/*
name NUMBER
---------- ---------
Tom 20,30
Jim (所影响的行数为 2 行)*/
--测试数据
create table table1(AID int,NAME nvarchar(20))
create table table2 (BID int,NUMBER nvarchar(20))
insert into table1 select 1,'Tom' union all
select 2,'Jim'
insert into table2 select 1,20 union all
select 1,30
--函数
create function F_Str(@ID int)
returns nvarchar(100)
as
begin
declare @S nvarchar(100)
select @S=isnull(@S+',','')+NUMBER from table2 where BID=@ID
return @S
end
--查询
select NAME,NUMBER = dbo.F_Str(AID) from table1
--结果
-------------------
Tom 20,30
Jim NULL
DROP TABLE A
IF OBJECT_ID('B') IS NOT NULL
DROP TABLE B
go
CREATE TABLE A(
AID INT
,[NAME] VARCHAR(50)
)
INSERT INTO A
SELECT 1 ,'Tom' UNION ALL
SELECT 2 ,'Jim'
CREATE TABLE B(
BID INT
,[NUMBER] VARCHAR(50)
)
INSERT INTO B
SELECT 1 ,'20' UNION ALL
SELECT 1 ,'30'
GO
select name ,
number=isnull(stuff((select ','+rtrim(number) from b where a.aid=bid for XML path('')),1,1,''),'')
from A
/*
name number
-------------------------------------------------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Tom 20,30
Jim */