有没有办法在 Excel 中自动执行 VLOOKUP？

Question

I have an excel table with column 1 like a,b,c,a,d,e,a,b and column 2 with some numbers 1,2,3,4,5... I use vlookup to scan the table for say 'a' and give its corresponding number which returns the value for the first instance of a.

How do I make excel return it for the next time a is mentioned? It is a huge table and I cannot modify the array each time.

Answer 1

To extract the corresponding numbers for each instance "a", just write:

=FILTER(B2:B100,A2:A100="a")

If you want the nth instance, that's as easy as writing:

=INDEX(FILTER(B2:B100,A2:A100="a"),nth)