When mysql_query returns false

Question

Aside from writing the wrong query and not having permissions to access a table, when mysql_query returns false? Are there any other cases?

Answer 1

Thank you for your comment.
I am sure there is absolutely no need to dig into such details.

A thing you really need is error message which you can read and thus get informed of the particular problem.

So, it seems that mysql_error() function is really what you're looking for.

$res = mysql_query($sql) or trigger_error(mysql_error()." in ".$sql);

looks sufficient enough.