问一个简单的sql,马上结
表
字段x y
aaa 111
aaa 222
aaa 333
bbb 111
bbb 222
显示
aaa 111 222 333
bbb 111 222
请问大家这样怎么实现啊
[解决办法]
--带符号合并行列转换
--有表t，其数据如下：
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)
go
if 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 tb
drop 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
go
create 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)
go
if 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 test
drop 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)
[解决办法]
参考这种方法：
create table T(id varchar(100), strn varchar(100))
insert into T select 'z01 ', 'asd '
insert into T select 'z01 ', 'sdf '
insert into T select 'z02 ', 'qwe '
insert into T select 'z03 ', 'jkl '
insert into T select 'z04 ', 'iop '
SELECT id,
CAST(MIN(strn) as varchar(100))+
CASE
WHEN COUNT(*)=1 THEN ' '
ELSE ', '+CAST(MAX(strn) as varchar(100))
END as strn
FROM T
GROUP BY id
drop table T
[解决办法]
create table test(x varchar(10),y int)
insert test select 'aaa ',111
union all select 'aaa ',222
union all select 'aaa ',333
union all select 'bbb ',111
union all select 'bbb ',222
go
create function dbo.fn_Merge(@x varchar(1000))
returns varchar(8000)
as
begin
declare @name varchar(8000)
set @name= ' '
select @name=@name+ ' '+rtrim(y) from test where x=@x
return stuff(@name,1,1, ' ')
end
go
select distinct x,dbo.fn_Merge(x) from test
drop table test
drop function fn_Merge
[解决办法]
--建境
Create Table 表
(x Varchar(100),
y Varchar(100))
Insert 表 Select 'aaa ', '111 '
Union All Select 'aaa ', '222 '
Union All Select 'aaa ', '333 '
Union All Select 'bbb ', '111 '
Union All Select 'bbb ', '222 '
GO
--建函
Create Function F_TEST(@x Varchar(100))
Returns Nvarchar(1000)
As
Begin
Declare @S Nvarchar(1000)
Select @S = ' '
Select @S = @S + ' ' + y From 表 Where x = @x
Select @S = Stuff(@S, 1, 1, ' ')
Return @S
End
GO
--
Select
x,
dbo. F_TEST(x) As y
From
表
Group By
x
GO
--除境
Drop Table 表
Drop Function F_TEST
--果
/*
xy
aaa111 222 333
bbb111 222
*/
[解决办法]
Create Table 表
(x Varchar(100),
y Varchar(100))
Insert 表 Select 'aaa ', '111 '
Union All Select 'aaa ', '222 '
Union All Select 'aaa ', '333 '
Union All Select 'bbb ', '111 '
Union All Select 'bbb ', '222 '
GO
declare @sql varchar(2000)
set @sql= 'select x '
select @sql = @sql + ',sum(case cast(Z as varchar) when ' ' '+cast(Z as varchar)+ ' ' ' then y else 0 end) as ' ' '+cast(Z as varchar)+ ' ' ' '
from (select distinct Z from (select distinct z from (select * ,(select count(1) from 表 where a.x=x and a.y> y) z from 表 a)a)a)a
select @sql = @sql + ' from (select * ,(select count(1) from 表 where a.x=x and a.y> y) z from 表 a)a group by x '
exec (@sql)
/***
x 0 1 2
----- ----------- ----------- -----------
aaa 111 222 333
bbb 111 222 0
(2 行受影响)
**/
偷用dawugui(潇洒老乌龟) 的数据