Hi Sumeet!
Create an attribute view with the left outer join.
Create a graphical calculation view.
Pull in a projection, and drop the attribute view.
On the OUTPUT panel use the EDIT FILTER EXPRESSION to add the isNull() function to the desired field.
Make other attribute views for the other pair of tables, do the projections in the calculation view and connect them with a join, and map the fields.
At the end we used a scripted calculation view, because we do not use it for big data, only for a few rows in each table pairs, and it seemed easy just to copy&paste the code instead of making many attribute views. But we tried the attribute view way as well and it worked well.
If you need more explanation do not hesitate to ask! 