How to get unmatched data between two sources in SSIS Data Flow?

Question

I have two data sources, one sql table, one flat file (csv). Both sources have exact same columns. Example Data:

Table:

HCN  Name  Surname   DOB
111          


        

Answer 1

Firstly I suggest you to load Flat file data into OLEDB staging table, Which is optional. If you Load flat file data into destination, you can align primary keys for the look up.

Create a staging table to insert unmatched records, you will only need asynchronous transformation in this case

Refer Below for Look up Transformation

Check for Look up Columns:

Here is example