Lookup using INDEX and MATCH with two criteria

Question

I am trying to achieve a basic lookup using INDEX and MATCH. My layout is:

Sheet 1
NAME | SITE | DATE

Sheet 2
NAME | SITE | DATE

I want the \'SITE\' co

Answer 1

Here is the solution without using an array and without using a helper column:

=INDEX(Table[returnColumnName], 
MATCH(1, INDEX((Table[lookupColumn1] = "arraysAreSlow") * 
(Table[lookupColumn2] = "avoidWherePossible"), 0, 1), 0))

Here is a more advanced solution that performs a grid lookup:

=INDEX(Table,
MATCH(1, INDEX((Table[lookupColumn1] = "arraysAreSlow") * 
(Table[lookupColumn2] = "avoidWherePossible"), 0, 1), 0),
MATCH("returnColumnName", Table[#Headers],0))