Help with inserting records conditionally in another table

Question

I need some help on this task please. I have a table with some records like so
Table1
Column1   Column2   Column3      Colum4
1                 Name1    Lastname1     1,2
2                 Name2    Lastname2     3
3                  Name3    Lastname3     NULL
4                  Name4    Lastname4     1,3
So the last column, Column4 has the number of the column that the values got changed. So the values on the first row on the Columns 1 and 2 got changed. So I have to insert those values in another table and the same for the other records.
Table2
Column1   Column2    Column3      
1                Name1     NULL
2                 NULL      Lastname2
4                 NULL      Lastname4
Any ideas on how to accomplish this? Any ideas would be much appreciated.

Answer 1

Hi
Try below, Next time please POST DDL & DML
select 1 Column1, 'Name1' Column2, 'Lastname1'Column3, '1,2' Colum4 into #temp union all
select 2 , 'Name2', 'Lastname2', '3' union all
select 3 , 'Name3' , 'Lastname3', NULL union all
select 4, 'Name4', 'Lastname4', '1,3'union all
select 5, 'Name4', 'Lastname4', '1'
select 1 Column1 ,'Name1' Column2, NULL Column3 into #temp1 union all
select 2 ,NULL ,'Lastname2' union all
select 4, NULL, 'Lastname4'
select Column1, Column2, Column3, Colum4 ,C2,C1 from #temp a
--(select Column1, Column2, Column3, case when Colum4 like '%,%' OR Colum4 IS null then Colum4 else Colum4+',' end as Colum4 from #temp) a
outer apply (select COALESCE(Column2,Column3) From #temp1 where column1 = parsename(replace(a.colum4,',','.'),1)) a1(C1)
outer apply (select COALESCE(Column2,Column3) From #temp1 where column1 = parsename(replace(a.colum4,',','.'),2)) a2(C2)
You can also use split function
http://sqlperformance.com/2012/07/t-sql-queries/split-strings
select a.*,COALESCE(a2.Column2,a2.Column3) From #temp a
cross apply dbo.Split(Colum4,',') a1
left outer join #temp1 a2 on a1.item=a2.Column1
Thanks
Saravana Kumar C