Martin Gallagher wrote:
Hi,
I'm trying to find the most efficient way of "linking" members to one
another in a social networking application.
Currently I link them using 2 separate fields for the members: id1, id2. So,
to find people in your network you would do:
I'm not sure exactly what it is you are doing but I think this may be
it. You have a table of people and you want to know who is friends with
who. I know 'friend' may not be the best term to use but it is easier
to type. So I have my people table.
People{
*PID,
Name,
. . .
}
Then the Friend Table,
Friend{
*PID,
*FID
}
If you have person, John, with ID 234, and you want to know all his
friends you can do this...
SELECT f.FID, p.Name
FROM Friend f JOIN People p ON f.FID = p.PID
WHERE f.PID = 234
of course you have the problem where john has Joe as a friend but Joe
doesn't have john as a friend. This seeming inconsistency, may or may
not be a problem depending on exactly what kind of a relationship you
are trying to define.
--
Chris W
KE5GIX
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