Question

I have three individual queries that are used to select users dependent on the variables. Each user has a unique user ID which is on each table effected by the queries. Is there a way, with PHP, that I can only select the users that return for all three queries?

Answer 1

Yes, do an inner join on all three tables using the common field.

Ex:

 Select cola, colb
 From tablea join tableb
 On a.commoncolumn=b.commoncolumn
 Join tablec on a.commoncolumn=c.commoncolumn
 Where ...