I am working on a SAS migration project where in need to write large SQL queries.
My question is, can i create the derived columns while writing the query itself
Or shall I create them in the package… ?
Which procedure will improve the performance of my package..
If I prolong my query, due to sub queries the number of Select statements are increasing in my query..
That means the number of times that I am hitting the data base is increasing..
So, instead of that do I need to create the derived columns in SSIS package…
After doing all these things I need to Join with same length of Query…
So I thought to create two datasets completely including derived columns in the query itself
Then latter I want to join them in SSIS package….
Please suggest me which is the best way in my scenario. Creating the derived columns in query or SSIS package…. ??
Thanks & Regards $@m