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I was told a while ago on this site that the only way to go with a many-to-many (in my case a facebook-ish ‘friend-ing’ system) is to do something like this:
uid(PK) friend_id 4 23 4 20 4 54 32 20 32 89 Wont this leave me with lots of identical primary keys (which i believe isn’t possible?) And if I can’t set uid as a PK, how can I quickly search the table? There must be a way to get away with this with a PK.
Thanks!
If you have a many to many relationship, you can develop a table in between where you create a dual primary key with the UID and the Friend_ID together. That way there should only be one instance of a pair of UID/Friend_ID.