What's the best way to calculate similarity between rows in a table based on association?

Posted by André Pena on Stack Overflow See other posts from Stack Overflow or by André Pena
Published on 2010-06-13T01:15:22Z Indexed on 2010/06/13 1:22 UTC
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Filed under:

c#

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.NET

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sql

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sql-server

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orm

Suppose each Person has a collection of favorite Books.

So I have a table for:

Person
Book
The association between Person and Book (joint table for MxN)

I want to fetch the Persons that are similar to a Person1 based on the favorite Books overlaping. That is: The more books they have in common, the more they are similar.

I don't have to use only SQL to solve this problem. I could use programming also. I'm using SQL Server 2008 and C#.

What solution would you experts use?

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