我有2列的值。 试图查找列A中哪些不在列B中的值

Question

Column A has 868 Rows and Column B has 452 rows. How do I find all the values in Column A that are not in Column B?

Answer 1

A quick way would be to use a helper column, let's say C. You can use Countif() to quickly check, then If() to make it logical:

=If(Countif($B:$B,$A1)=0,"Not in Col. B","")

I wouldn't use the entire B column, for calculating/processing time, so adjust that range as necessary. You could then sort by column C to bring all "Not in Col. B" to the top.

Edit: Ah, it's basically @pnut's suggestion, with a little more for ease of reading. Also, probably would want to add If($A1<>"",...) just to make sure blank cells don't return "Not in Col. B"

Answer 2

If the values are distinct, then easier alternative with conditional formatting:

Select both ranges or columns > Home > Conditional Formatting > Highlight Cell Rules > Duplicate Values... > Unique > OK