So my problem is,
所以我的问题是,
I have 4 columns(A,B,C,D) and I need to find out if a value in column C exists in column A, if it does I need to look for the value in column D(on my initial value's row) and check if it is same with the value in column B(on the row which I've found a match) and then do this for every value in column C.I have 4 columns
