高分请教高手,应该如何写SQL语句或者存储过程,把表A的格式存成表B的格式?
表A
SID ACCOUNT
1 王大
1 张三
2 李四
2 钱武
表B
SID ACCOUNT
1 王大,张三,
2 李四,钱五,
------解决方案--------------------需要借助函数处理。
------解决方案--------------------函数,参考:
--测试数据
create table csdn(id int,txt varchar(10))
insert csdn
select 1, 'a ' union all
select 1, 'b ' union all
select 1, 'c ' union all
select 2, 'aa ' union all
select 2, 'bb ' union all
select 2, 'cc ' union all
select 3, 'aaa ' union all
select 3, 'bbb '
--select * from csdn
go
create function Gettxt(@id int)
returns varchar(8000)
as
begin
declare @s varchar(8000)
set @s= ' '
select @s=@s + ', ' +txt from csdn where id=@id
--return @s
return stuff(@s,1,1, ' ')
end
go
select id,dbo.Gettxt(id) txt from csdn group by id
go
drop function Gettxt
drop table csdn
------解决方案--------------------create function fn_test(@sid int)
returns varchar(100)
AS
begin
declare @str varchar(100)
set @str= ' '
select @str=@str+ACCOUNT+ ', ' from 表A where sid=@sid
return @str
end
GO
insert into 表B
select SID ,fn_test(SID) as ACCOUNT
from 表A
group by SID
------解决方案--------------------declare @t table( sid int ,account varchar(10))
insert into @t select 1, '王大 '
union all select 1, '张三 '
union all select 2, '李四 '
union all select 2, '钱武 '
SELECT *
FROM(
SELECT DISTINCT
sid
FROM @t
)A
OUTER APPLY(
SELECT
[values]= STUFF(REPLACE(REPLACE(
(
SELECT account FROM @t N
WHERE sid= A.sid
FOR XML AUTO
), ' <N account= " ', ', '), ' "/> ', ' '), 1, 1, ' ')+ ', '
)N
/*
sid values
----------- -------------
1 王大,张三,
2 李四,钱武,
(2 行受影响)
*/