Need help to acheive Duplicate Contacts detector

Hi All,
I need to develop a feature in which my app would detect all the duplicate contacts of the user. A user can have many contacts. App shall find all his contacts which match on the basis of email, name and mobile number.
I am quite confused as what can be the logic here? Where should I do this work? Should I do it in a stored procedure or will something work in Java. I am using Hibernate as the ORM tool. Can I use some of the features of hibernate for this problem?
If I go by simple algorithm then I would probably have to make n database requests where n is the number of contacts.
Any help will be highly appreciated.
Regards,
Nitin

You can certainly do it in a stored proc.
Unless you are going to do it a lot then it doesn't matter.
Although "many" might come into play there. 10 is nothing. 100,000 is.

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