VBA检查两列中的单元格值

Question

I am looking for a solution to the following Problem. I have a table with 2 columns and I need a macro to check if the rows that have same values in first column, also have the same values in another column and give an error message if not. For example,

   1. a 12
   2. b 1
   3. c 567
   4. a 12
   5. c 567
   6. c 567
   7. b 1 

If for example in the 7. row the value in the second column is "2", then the error message will appear. Any ideas how to do that?

Answer 1

根据公式使用数据验证作为“自定义”：

=isnumber(match(<relative cell address of top cell>, $a:$a, 0))