How to check for duplicates in a list of names and dates

[Guest]

I am using microsoft excel 2000, (9.0.2720)

In a list of bookings, comprising names locations and dates, I need to
highlight any problem of duplication. So if I book the same person into two
locations on a single date or two people for the same location on a single
date I need to highlight that problem. Is there a method of doing this in
excel please?

 

[Guest]

check out Chip Pearson's site for help with this

http://www.cpearson.com/excel/duplicat.htm

 

[Guest]

Robert,MofD" wrote:

That works for a single list, locating duplicates.

What I need though is to spot the duplicates for a single date. The same
name will normally occur frequently on different dates.

 

[Bob Phillips]

Try this

=IF(SUMPRODUCT(--($A$1:$A$20=A1),--($B$1:$B$20=B1))>1,"Dup","")

 

[Guest]

Thanks, that's a great solution and it works on both sets of data for
locations or people with dates.

Ideally I would like to colour the cell, say A1, in red to make the
duplication really stand out during data entry.

Is that possible?

Thanks anyway for a really good solution.

 

[Bob Phillips]

Yeah, select all of your cells in column A, goto Form at>Conditional
Formatting, change Condition 1 to Formula Is, and the input that formula,
select the pattern tab, choose the red colour, then exit out.