I want to keep it in field A (or any other field) only if there is a matching column in field A and field B, as shown in the figure below. It seems good to use the "foreach" statement, but I don't know how to implement it. No Field A Field B 1 100   2 200   3 300   4   100 5   4000 6   5000   Extract only the No. 1 column. No Field A Field B 1 100   ... View more