Surely you can wait 10min..... Its 24/7 staff you seem to want.

1. You cant execute more then one query though mysql_query, here some code I wrote that can enable you to do this in a different way Multiple mysql queries


2. I dont get what you are trying to do, why not select both via aliasing?
// I want t1's users to be t2's users
$query = " SELECT t1.users AS t1_users,t2.users AS t2_users FROM t1,t2;


3. Modify an existing MySQL column - Tech-Recipes.com

A quick google serach could have answered the second two

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