INDEX/MATCH with 4 columns - excel

Question

I have an Excel file with 2 sheets - one sheet contains my items, prices, codes, etc. and the other sheet is for cross-matching with competitors.
I've included an Excel file and image below.
I want to be able to generate my code automatically when manually entering any of my competitor's codes. I was able to do INDEX/MATCH but I was only able to match with one column (I'm assuming they're all in one sheet to make it easier). Here is my formula:
=INDEX(C:C,MATCH(K2,E:E,0)
So this is looking only in E:E, when I tried to enter a different column such as C:C or D:D it returns an error.
I tried to do the MATCH as C:G but it gave an error right away.

Answer 1

The reason why match gave you error is because it's looking for an array and you put in multiple columns.
There is definitely a more elegant way to do this but this is the first one that I came up with.
=IFERROR(INDEX(B:B,MATCH(K2,C:C,0)),IFERROR(INDEX(B:B,MATCH(K2,D:D,0)),IFERROR(INDEX(B:B,MATCH(K2,E:E,0)),IFERROR(INDEX(B:B,MATCH(K2,F:F,0)),IFERROR(INDEX(B:B,MATCH(K2,G:G,0)),"")))))

Answer 2

Index/Match Combination
Please try this formula:
{=INDEX($B$2:$B$5,MATCH(1,(K2=$C$2:$C$5)+(K2=$D$2:$D$5)+(K2=$E$2:$E$5)+(K2=$F$2:$F$5)+(K2=$G$2:$G$5),0))}
Instruction: Paste the formula {without the curly brackets} to the formula bar and hit CTRL+SHIFT+ENTER while the cell is still active. This will create an array formula. Hence, the curly brackets. Please take note though that manually entering the curly brackets will not work.
Description:
The INDEX function returns a value or the reference to a value from within a table or range.1
The MATCH function searches for a specified item in a range of cells, and then returns the relative position of that item in the range.2
Syntax:
The INDEX function has two forms—Array and Reference form. We're going use the Reference form in this case.
INDEX(reference, row_num, [column_num], [area_num])1
MATCH(lookup_value, lookup_array, [match_type])2
Explanation:
To simplify, we're going to use this form:
INDEX(reference, MATCH(lookup_value, lookup_array, [match_type]))
The INDEX function returns a value from the reference My code column (B1:B5) based on the row_num argument, which serves as an index number to point to the right cell, and we're going to do that by substituting row_num with MATCH function.
MATCH function, on the other hand, returns the relative position of a value in competitorn column that matches the value in individual cells of the competitor code column.
To make it work with multiple lookup range, we're going to create arrays of boolean values (TRUE/FALSE, aka logical values) by comparing values from individual cells in competitor code column with values in individual competitorn columns. Now, we convert these boolean values into numerical values by performing a mathematical operation that does not alter its implied value (i.e. TRUE=1, FALSE=0). We're going to add these values directly to make it simple. The resulting array have four index with two possible values: 1 or 0. Since each item in MATCH's lookup_array is unique, then there can be only one TRUE or 1. The rest are FALSE or 0's. So, with that knowledge, we're going to use it as our lookup_value.
Let's dissect the formula:
=INDEX(B2:B5,MATCH(1,(K2=C2:C5)+(K2=D2:D5)+(K2=E2:E5)+(K2=F2:F5)+(K2=G2:G5),0))
My code 2 = INDEX({"My code 1";"My code 2";"My code 3";"My code 4"},MATCH)
My code 2 = INDEX({"My code 1";"My code 2";"My code 3";"My code 4"},(2))
2 = MATCH(1,(K2=C2:C5)+(K2=D2:D5)+(K2=E2:E5)+(K2=F2:F5)+(K2=G2:G5),0)
2 =MATCH(1,
{FALSE;FALSE;FALSE;FALSE}+
{FALSE;FALSE;FALSE;FALSE}+
{FALSE;FALSE;FALSE;FALSE}+
{FALSE;FALSE;FALSE;FALSE}+
{FALSE;TRUE;FALSE;FALSE},0))
OR
=MATCH(1,
{0;0;0;0}+
{0;0;0;0}+
{0;0;0;0}+
{0;0;0;0}+
{0;1;0;0},0))
=========
{0;1;0;0},0))
2 = MATCH(1,{0;1;0;0},0))
I hope this answer is helpful.
References and links:
INDEX function
MATCH function
Create an array formula