Need magic for identifieing double adresses

  Hi,

I need to clean up a lot of contact data because of a merge of customer
lists that used to be kept separate.
I allready know that there are double entries within the lists and they
do overlap, too.

Relevant fields could be  name, street, zip, city, phone

Is there a way to do something like this with postgresql ?

I fear this will need still a lot of manual sorting and searching even
when potential peers get automatically identified.


Regards
Andreas