Excel Why is my IF-formula not working?

问题:

I have this formula:

=IF(testing!I:I=A6;testing!A:A;"wrong")

I want to control with the formula whether the mapping of values is right.
I want to know whether the value in A6 has more corresponding values in the column A in the 'testing'-sheet. So when A6 appears in the column I, I either want to know which corresponding value it has in column A, OR if he has MORE THAN ONE, I want to get 'wrong' as an answer.

回答1:

I think that is because if you simplify the test to just =I:I=A6 that will always return FALSE.

回答2:

Code:

=IF(COUNTIF(testing!I:I,A6)=1,INDEX(testing!A:A,MATCH(A6,testing!I:I,0)),"Wrong")