displaying duplicate records...

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I have a database which allows people to upload info and foto's. There's a
unique ID field, but some people tend to upload their info more than once
(its a contest site). What I'm able to do is to see how may duplicates there
are using the following statement:

$query="SELECT COUNT(*) as cnt, voornaam,achternaam,leeftijd,ID,email FROM
modellen GROUP BY email HAVING cnt >1";

But this only gives me numbers. Does anyone know how to display every record
that has multiple duplicate ?

Or is there an elegant way to stop people from entering their info more than
once?



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