Hello,
I would like to have a SQL join that allow me to exclude the value that are in a table A but they are not in the table B.
I mean, imagine that I have 2 table and in both there are a common field.
In the table A, this field contain 100 values, in the Table B this field contain 80 values. I would like to have the 20 in difference (so the join must exclude the 80 in common).
Thank you in advance.
