I just set up my first ETL that imports data from two different Excel worksheets into two different SQL Server tables.
In the mappings I seem to get the first columns (before data conversion) as well as the second columns i.e. TotalBalance and Copy of TotalBalance. I only really need the Copy of TotalBalance which has had the data type changed to Decimal(28,2) automatically (I changed this from float). I don't know how to just have the columns I am looking for.
Also, is what I have done correct? (screenshots attached).