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Thanks for the reply azzazzello. I realise I can do that, but I was worried that it would be very inefficient once there are thousands of users in the table. However, I found out that I can set 'username' to be indexed, and therefore it won't be too inefficent. I'll get to work on it...

I'm a newbie to databases - well, large ones anyway. I'm trying to design a database which stores 'bookmarks' for users in a hierchachical fashion. I've figured out how to do that for one person (adjacency list, in one table). So for multiple users, I have one table to store user details -...