Procedure to get the number to match the preferences of the user

Hi all
I need to sort the corresponding preferences users, and because of the large number of lines, I need to do in the data store, and not in the layer of business logic.
Imagine I have a table like
USER PREFERENCES

THE USER PREFERENCE
2B
1 B
1 D
2A
2 C
3B
3 C
3 D
4 C
4 E

I need to develop a stored procedure which returns a selection of lines given the user I want to serve as a comparison

getMatchingUsers (1)

CORRESPONDENCE OF THE USER
3 2
2 1
4 0

This is the number of matching preferences for users except the one to which we refer to the. any idea on how to develop it? This is a known design sql template?
Thanks in advance,
Alessandro

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