Learn how to compare multiple columns in Excel for matches.

To compare multiple columns in Excel for matches, you can use various methods based on your specific requirements. If you aim to compare four columns, one approach involves using conditional formatting. Select the first column, go to /”Conditional Formatting,/” choose /”Highlight Cells Rules,/” and then opt for /”Duplicate Values./” This visually highlights matching values. For comparing multiple columns for matches, you can utilize functions like IF, COUNTIF, and AND to create custom formulas. If you’re specifically looking for an exact match between columns, you can employ the EXACT() function or use the = operator. To compare lists for matches in Excel, the VLOOKUP() or MATCH() functions can be useful, helping you identify commonalities or discrepancies between different sets of data.

The following formula convert 2 dimension array for dataset into a single column

=TOCOL(A2:D18)

Lets breakdown this formula.

=FILTER(UNIQUE(G2#), COUNTIF(G2#, UNIQUE(G2#)) ＞ 1)

1) UNIQUE(G2#):
This part takes the range of values in column G (from cell G2 to the end of the data in column G, represented by G2#) and returns a list of unique values. It removes any duplicate values.

2) FILTER(UNIQUE(G2#), COUNTIF(G2#, UNIQUE(G2#)) ＞ 1):
The FILTER function is used to filter the unique values obtained in step 1.
The condition for filtering is specified by COUNTIF(G2#, UNIQUE(G2#)) ＞ 1. This condition checks how many times each unique value appears in the original range (G2#), and it only includes values that have a count greater than 1. In other words, it filters out values that are duplicated in the original range.
So, in summary, the entire formula filters out unique values from column G (excluding duplicates) that appear more than once in the original range. The result is a list of values that have duplicates in column G.

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