VLOOKUP by Combining 2 Columns to Form a Unique Key

Question

For the following table,

I want to look up the value in col C. Since the values in col A an

Answer 1

You can use VLOOKUP if your lookup value is a concatenation of your two or more key fields (A2&B2). Then, add a first sorted column in your LUT sheet with the array that is the concatenation of the same key fields. Viola.

Answer 2

The way I usually do it is by concatenating the values separated by a pipe character (|). See the formula in the screenshot below.

Then you can vlookup using the concatenated key.

=VLOOKUP("1|foo",$C$1:$D$7,2,FALSE)

Answer 3

You can use an array formula:

=INDEX($C$1:$C$7,MATCH("1foo",$A$1:$A$7 & $B$1:$B$7,0))

just select in example D1, enter formula in formula bar and press CTRL+SHIFT+ENTER to evaluate it