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General Discussion

Query that joins fields from each table where those fields contain corresponding info

Hello, i was wondering if anyone knew how to correlate data so only corresponding information pops up in a search. A good example is singles.com. Lets say a girl wants a man who is tall, blond, and has a job... so then her info goes through a filter which will then lead her to the criteria of the man she asked for. How does this correlation of data work? thanks.