ID foodId price userName createTime
aaaaaaaa 111 11 张三 2011-01-05 00:00:00.000
bbbbbbbb 111 21 李四 2011-01-12 00:00:00.000
cccccccc 111 13 王五 2011-01-23 00:00:00.000
dddddddd 222 20 赵六 2011-01-30 00:00:00.000
结果应该输出如下格式:
111,11,21,13,张三,李四,王五,2011-01-05 00:00:00.000,2011-01-12 00:00:00.000,2011-01-23 00:00:00.000;222,20,赵六,2011-01-30 00:00:00.000;
aaaaaaaa 111 11 张三 2011-01-05 00:00:00.000
bbbbbbbb 111 21 李四 2011-01-12 00:00:00.000
cccccccc 111 13 王五 2011-01-23 00:00:00.000
dddddddd 222 20 赵六 2011-01-30 00:00:00.000
结果应该输出如下格式:
111,11,21,13,张三,李四,王五,2011-01-05 00:00:00.000,2011-01-12 00:00:00.000,2011-01-23 00:00:00.000;222,20,赵六,2011-01-30 00:00:00.000;
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 varchar(10)) returns varchar(1000)
as
begin
declare @str varchar(1000)
select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id
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
returns varchar(1000)
as
begin
declare @temp varchar(1000)
set @temp = ''
if @num =1
select @temp = @temp + ',' + ID from tb where foodId=@foodid
else if @num = 2
...
else if @num = 3
....
return @temp
end
(
ID varchar(10),
foodId int,
price int,
userName nvarchar(10),
createTime datetime
)
insert #temp
select 'aaaaaaaa', '111', '11', N'张三', '2011-01-05 00:00:00.000' union all
select 'bbbbbbbb', '111', '21', N'李四', '2011-01-12 00:00:00.000' union all
select 'cccccccc', '111', '13', N'王五', '2011-01-23 00:00:00.000' union all
select 'dddddddd', '222', '20', N'赵六', '2011-01-30 00:00:00.000'
go
--SQL:
select
[value] =
ltrim(foodId)+
(select ','+LTRIM(price) from #temp where foodId = t.foodId for xml path('')) +
(select ','+userName from #temp where foodId = t.foodId for xml path('')) +
(select ','+convert(varchar(30), createTime, 121) from #temp where foodId = t.foodId for xml path(''))+';'
from #temp t
group by foodId
/*
value
111,11,21,13,张三,李四,王五,2011-01-05 00:00:00.000,2011-01-12 00:00:00.000,2011-01-23 00:00:00.000;
222,20,赵六,2011-01-30 00:00:00.000;
*/
as
begin
declare @str varchar(1000)
select @str=''
select @str=@str+cast(foodId as varchar)+','+cast(price as varchar)+','+ cast(OfferPerson as varchar)+',' from TBL_PriceOffer
where FoodID = @id
return @str
end
goselect FoodID, value = dbo.f_str(FoodID) from TBL_PriceOffer group by FoodID