I'm using the rand() function in a sql statement with php to obtain a certain amount of random items, now my question is will it include duplicates?

I want all of the items to be unique..... anyone who has some knowledge of this please help!

Thanks!
Rob

nevermind answered my own question, looks like it doesnt

sure it does - same as md5 creates duplicate (but only few was found :D)
in rand() case all depends how long you want to use created number and how long it is :)
i/e if it has 3 digits :) and you want to use it "forever" (for example as ID for your products) :) you will meet duplicates very soon :)