This is a mailing list of names and addresses where the input will come from
various people so there's a probability that a person will be entered more
than once. I'm trying to check the 5 columns while the data is being input
and give an error message if "Jane Doe, Apt. 101, 333 Main St, 12456" is
already on the list. The way I believe it should work is if a person is
entered twice, as they tab out of the zip column or hit enter on the second
entry, they will get the "duplicate" error message. Thanks.

"daddylonglegs" wrote:


What's your intention?

for B2, for instance, you seem to want to not allow any entry equal to
anything in columns C, F, G or J. If that's the case try

=COUNTIF(C:C,B2)+COUNTIF(F:F,B2)+COUNTIF(G:G,B2)+C OUNTIF(J:J,B2)=0


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daddylonglegs
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