现有表 t1 有4列
id code source des
1 1,22,333 ccc ddd
2 4444.55555 eee fff我要取数据为 @t (按照逗号截取并放入临时表)code source des
1 ccc ddd
22 ccc ddd
333 ccc ddd
4444 eee fff
55555 eee fff请教高手如何实现?自己写的运行结果只有
code source des
4444 eee fff
55555 eee fffdeclare @T table (code varchar(1000),source varchar(max),des varchar(max) )
declare @str varchar(max)
declare @source varchar(max)
declare @des varchar(max)
select @source = source from t1
select @des = des from t1
select @str = code from t1 --where @i = id
while charindex(',',@str) > 0
begin
insert into @T values(substring(@str,1,charindex(',',@str)-1),@source,@des)
set @str = substring(@str,charindex(',',@str)+1,len(@str))
end
insert into @T values(@str,@source,@des)select * from @T
id code source des
1 1,22,333 ccc ddd
2 4444.55555 eee fff我要取数据为 @t (按照逗号截取并放入临时表)code source des
1 ccc ddd
22 ccc ddd
333 ccc ddd
4444 eee fff
55555 eee fff请教高手如何实现?自己写的运行结果只有
code source des
4444 eee fff
55555 eee fffdeclare @T table (code varchar(1000),source varchar(max),des varchar(max) )
declare @str varchar(max)
declare @source varchar(max)
declare @des varchar(max)
select @source = source from t1
select @des = des from t1
select @str = code from t1 --where @i = id
while charindex(',',@str) > 0
begin
insert into @T values(substring(@str,1,charindex(',',@str)-1),@source,@des)
set @str = substring(@str,charindex(',',@str)+1,len(@str))
end
insert into @T values(@str,@source,@des)select * from @T
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[source],[des]
from t1 a,master..spt_values b
where b.type='p' and b.number<=len(a.code) and substring(a.code,b.number,1)<>','
and substring(','+a.code,b.number,1)=','
create table #tb
(
strs varchar(50)
)insert into #tb values ('500ml*1' )
insert into #tb values ('10g*10' )
insert into #tb values ('0.5DF:ASD*10' )
insert into #tb values ('10JSH*10*10')select * from #tbselect SUBSTRING(strs,1,CHARINDEX('*',strs)-1) from #tb
--------------------------------------------------
500ml
10g
0.5DF:ASD
10JSH(4 行受影响)select LEFT(strs,CHARINDEX('*',strs)-1) from #tb
--------------------------------------------------
500ml
10g
0.5DF:ASD
10JSH(4 行受影响)方法三select REPLACE(strs,right(strs,len(strs)-CHARINDEX('*',strs)+1),'') from #tb
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
500ml
10g
0.5DF:ASD
10JSH(4 行受影响)
方法四create function getabovestar
(@gg nvarchar(20))
returns nvarchar(20)
as
begin
return (case when charindex('*',@gg)>0 then left(@gg,charindex('*',@gg)-1) else @gg end)
end
go
select dbo.getabovestar(gg) from #tb
拆分表:--> --> (Roy)生成測試數據
if not object_id('Tab') is null
drop table Tab
Go
Create table Tab([Col1] int,[COl2] nvarchar(5))
Insert Tab
select 1,N'a,b,c' union all
select 2,N'd,e' union all
select 3,N'f'
Go--SQL2000用辅助表:
if object_id('Tempdb..#Num') is not null
drop table #Num
go
select top 100 ID=Identity(int,1,1) into #Num from syscolumns a,syscolumns b
Select
a.Col1,COl2=substring(a.Col2,b.ID,charindex(',',a.Col2+',',b.ID)-b.ID)
from
Tab a,#Num b
where
charindex(',',','+a.Col2,b.ID)=b.ID --也可用 substring(','+a.COl2,b.ID,1)=','
--2000不使用辅助表
Select
a.Col1,COl2=substring(a.Col2,b.number,charindex(',',a.Col2+',',b.number)-b.number)
from
Tab a join master..spt_values b
ON B.type='p' AND B.number BETWEEN 1 AND LEN(A.col2)
where
substring(','+a.COl2,b.number,1)=','
SQL2005用Xml:select
a.COl1,b.Col2
from
(select Col1,COl2=convert(xml,'<root><v>'+replace(COl2,',','</v><v>')+'</v></root>') from Tab)a
outer apply
(select Col2=C.v.value('.','nvarchar(100)') from a.COl2.nodes('/root/v')C(v))b
SQL05用CTE:;with roy as
(select Col1,COl2=cast(left(Col2,charindex(',',Col2+',')-1) as nvarchar(100)),Split=cast(stuff(COl2+',',1,charindex(',',Col2+','),'') as nvarchar(100)) from Tab
union all
select Col1,COl2=cast(left(Split,charindex(',',Split)-1) as nvarchar(100)),Split= cast(stuff(Split,1,charindex(',',Split),'') as nvarchar(100)) from Roy where split>''
)
select COl1,COl2 from roy order by COl1 option (MAXRECURSION 0)生成结果:
/*
Col1 COl2
----------- -----
1 a
1 b
1 c
2 d
2 e
3 f
*/
create table t1(id int,code varchar(20),source varchar(10),[des] varchar(10))
insert into t1 select 1,'1,22,333','ccc','ddd'
insert into t1 select 2,'4444,55555','eee','fff'
go
select substring(a.code,b.number,charindex(',',a.code+',',b.number+1)-b.number)code,source,des
from t1 a,master..spt_values b
where b.type='p' and b.number<=len(a.code) and substring(a.code,b.number,1)<>',' and substring(','+a.code,b.number,1)=','
/*
code source des
-------------------- ---------- ----------
1 ccc ddd
22 ccc ddd
333 ccc ddd
4444 eee fff
55555 eee fff(5 行受影响)*/
go
drop table t1
否则,先用逗号拆分存入临时表,再用小数点拆分.
if object_id('t1') is not null
drop table t1
go
create table t1
(
id int,
code varchar(20),
source varchar(10),
des varchar(10)
)
go
insert into t1
select 1,'1,22,333','ccc','ddd' union all
select 2,'4444,55555','eee','fff'
go
select code=substring(code,number,charindex(',',code+',',number)-number),source,des from t1 a cross join master..spt_values b where type='p' and number between 1 and len(code) and substring(','+code,number,1)=','
go
/*
code source des
-------------------- ---------- ----------
1 ccc ddd
22 ccc ddd
333 ccc ddd
4444 eee fff
55555 eee fff(5 行受影响)*/
很受用,但是我这个是好几万条数据master..spt_values 能支持吗?