I trying to split the csv to individual columns
SAMPLE DATA
PAR_COLUMN PERIOD VALUE mul_query
---------- ------ --------- ---------
1 601 10.134542 10.134542
1 602 20.234234 10.134542*20.234234
1 603 30.675643 10.134542*20.234234*30.675643
1 604 40.234234 10.134542*20.234234*30.675643*40.234234
2 601 10.345072 10.345072
2 602 20.345072 10.345072*20.345072
2 603 30.345072 10.345072*20.345072*30.345072
2 604 40.345072 10.345072*20.345072*30.345072*40.345072
EXPECTED RESULT :
PAR_COLUMN period value (No column name) (No column name) (No column name) (No column name)
---------- ------ --------- ---------------- ---------------- ---------------- ---------------
1 601 10.134542 10.134542 1 1 1
1 602 20.234234 10.134542 20.234234 1 1
1 603 30.675643 10.134542 20.234234 30.675643 1
1 604 40.234234 10.134542 20.234234 30.675643 40.234234
2 601 10.345072 10.345072 1 1 1
2 602 20.345072 10.345072 20.345072 1 1
2 603 30.345072 10.345072 20.345072 30.345072 1
2 604 40.345072 10.345072 20.345072 30.345072 40.345072
I tried like this. It is working but very slow when data is large. Is there any better alternative.
declare @sql varchar(max) = ''
set @sql =
';WITH Split_Names
AS
(
SELECT PAR_COLUMN,
mul_query,period,
CONVERT(XML,''<Names><name>''
+ REPLACE(mul_query,''*'', ''</name><name>'') + ''</name></Names>'') AS xmlname
FROM #finals
)
SELECT PAR_COLUMN,
period,
'
declare @start int =1 ,@count int
set @count = (select (max(period) - min(period))+1 from #finals)
while @start <= @count
begin
set @sql +=concat( 'isnull(xmlname.value(''/Names[1]/name[',@start,']'',''float''),1) , ')
set @start+=1
end
set @sql =left(@sql,len(@sql)-1)
set @sql+= ' FROM Split_Names'
exec( @sql)
Note: The question is NOT to convert CSV
to Individual Rows
. I am trying to convert CSV
to indivdual Columns
Basically am trying to calculate RUNNING Multiplication in Value
column
Dynamically solve this problem, use DSQL to add more columns in the result accordingly.
--create split function
CREATE FUNCTION [dbo].[SO_Split]
(
@List nvarchar(2000),
@SplitOn nvarchar(5)
)
RETURNS @RtnValue table
(
Id int identity(1,1),
Value nvarchar(100)
)
AS
BEGIN
While (Charindex(@SplitOn,@List)>0)
Begin
Insert Into @RtnValue (value)
Select
Value = ltrim(rtrim(Substring(@List,1,Charindex(@SplitOn,@List)-1)))
Set @List =Substring(@List,Charindex(@SplitOn,@List)+len(@SplitOn),len(@List))
End
Insert Into @RtnValue (Value)
Select Value = ltrim(rtrim(@List))
Return
END
--below is the dynamic solution for this problem
declare @sql nvarchar(3000) = 'select *'
declare @cnt int = 1
declare @rowNum int = (select max(a) from (select(select max(id) as id_max from dbo.so_split(mul_query,'*')) as a from #test) as b)
while(@cnt <= @rowNum)
begin
set @sql = @sql + N', ISNULL((select value from dbo.so_split(mul_query,''*'') where id = '+cast(@cnt as nvarchar(5))+N'),''1'')'
set @cnt = @cnt + 1
end
set @sql = @sql + N' from #test'
exec sp_executesql @sql
The result is attached below.
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