有表A:ID Name Value
1 jim K,
1 jim M,
1 jim L,
1 jim A,
2 Kate B,
2 Kate D,想得到如下结果:
ID Name Value
1 Jim K,M,L,A,
2 Kate B,D请问那位大哥,这个该怎么做? 谢谢各位了!
1 jim K,
1 jim M,
1 jim L,
1 jim A,
2 Kate B,
2 Kate D,想得到如下结果:
ID Name Value
1 Jim K,M,L,A,
2 Kate B,D请问那位大哥,这个该怎么做? 谢谢各位了!
ID Name Value
1 Jim K,M,L,A,
2 Kate B,D,
insert 表A
select 1,'jim','K,'
union all
select 1,'jim','M,'
union all
select 1,'jim','L,'
union all
select 1,'jim','A,'
union all
select 2,'Kate','A,'
union all
select 2,'Kate','D,'
CREATE FUNCTION ConStr(@id int)
returns varchar(1000)
as
begin
declare @str varchar(1000)
SET @str = ''
SELECT @str = @str + Value FROM 表A where id = @id
return @str
end select id , name , dbo.ConStr(id) from 表A group by id , name
a b
1 1
1 2
1 3
2 1
2 2
3 1
--如何转换成如下结果:
a b
1 1,2,3
2 1,2
3 1 create table tb
(
a int,
b int
)
insert into tb(a,b) values(1,1)
insert into tb(a,b) values(1,2)
insert into tb(a,b) values(1,3)
insert into tb(a,b) values(2,1)
insert into tb(a,b) values(2,2)
insert into tb(a,b) values(3,1)
goif object_id('pubs..f_hb') is not null
drop function f_hb
go--创建一个合并的函数
create function f_hb(@a int)
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + ',' + cast(b as varchar) from tb where a = @a
set @str = right(@str , len(@str) - 1)
return(@str)
End
go--调用自定义函数得到结果:
select distinct a ,dbo.f_hb(a) as b from tbdrop table tb--结果
a b
----------- ------
1 1,2,3
2 1,2
3 1(所影响的行数为 3 行)
多个前列的合并
数据的原始状态如下:
ID PR CON OP SC
001 p c 差 6
001 p c 好 2
001 p c 一般 4
002 w e 差 8
002 w e 好 7
002 w e 一般 1
===========================
用SQL语句实现,变成如下的数据
ID PR CON OPS
001 p c 差(6),好(2),一般(4)
002 w e 差(8),好(7),一般(1)if object_id('pubs..tb') is not null
drop table tb
gocreate table tb
(
id varchar(10),
pr varchar(10),
con varchar(10),
op varchar(10),
sc int
)
insert into tb(ID,PR,CON,OP,SC) values('001', 'p', 'c', '差', 6)
insert into tb(ID,PR,CON,OP,SC) values('001', 'p', 'c', '好', 2)
insert into tb(ID,PR,CON,OP,SC) values('001', 'p', 'c', '一般', 4)
insert into tb(ID,PR,CON,OP,SC) values('002', 'w', 'e', '差', 8)
insert into tb(ID,PR,CON,OP,SC) values('002', 'w', 'e', '好', 7)
insert into tb(ID,PR,CON,OP,SC) values('002', 'w', 'e', '一般', 1)
goif object_id('pubs..test') is not null
drop table test
go
select ID,PR,CON , OPS = op + '(' + cast(sc as varchar(10)) + ')' into test from tb--创建一个合并的函数
if object_id('pubs..f_hb') is not null
drop function f_hb
go
create function f_hb(@id varchar(10),@pr varchar(10),@con varchar(10))
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + ',' + cast(OPS as varchar) from test where id = @id and @pr = pr and @con = con
set @str = right(@str , len(@str) - 1)
return(@str)
End
go--调用自定义函数得到结果:
select distinct id ,pr , con , dbo.f_hb(id,pr,con) as OPS from testdrop table tb
drop table test--结果
id pr con OPS
---------- ---------- ---------- -------------------
001 p c 差(6),好(2),一般(4)
002 w e 差(8),好(7),一般(1)(所影响的行数为 2 行)create table b
(col varchar(20))insert b values ('a')
insert b values ('b')
insert b values ('c')
insert b values ('d')
insert b values ('e')
declare @sql varchar(1024)
set @sql=''
select @sql=@sql+b.col+',' from (select col from b) as b
set @sql='select '''+@sql+''''
exec(@sql)
drop table tb
gocreate table tb
(
ID varchar(10),
Name varchar(10),
Value varchar(10)
)insert into tb(ID,Name,Value) values('1', 'jim' ,'K,')
insert into tb(ID,Name,Value) values('1', 'jim' ,'M,')
insert into tb(ID,Name,Value) values('1', 'jim' ,'L,')
insert into tb(ID,Name,Value) values('1', 'jim' ,'A,')
insert into tb(ID,Name,Value) values('2', 'Kate' ,'B,')
insert into tb(ID,Name,Value) values('2', 'Kate' ,'D,')
goif object_id('pubs..f_hb') is not null
drop function f_hb
go--创建一个合并的函数
create function f_hb(@id varchar(10),@name varchar(10))
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + cast(Value as varchar) from tb where id = @id and name = @name
set @str = right(@str , len(@str))
return(@str)
End
go--调用自定义函数得到结果:
select distinct id , name ,dbo.f_hb(id , name) as value from tbdrop table tb--结果
id name value
---------- ---------- ---------
1 jim K,M,L,A,
2 Kate B,D,(所影响的行数为 2 行)