So I want to load information from this excel file into a tmp table and group the information in that tmp table with the acct_nbr from another table. I tried left joining the new table to the old one but it increases the amount of rows i have and includes acct_nbr's that are not in the original 'LoanLoss' table.
How do I link these two table by acct_nbr so that the only acct_nbr's that appear are in the LoanLoss table before i load the excel sheet in??