How to check result of sql query?

Question

PHP

I need to execute the code in the if statement below if the result of the $res query returns true.
Is it possible to do so? Or do you need to do fetch_array?

if ($res=$actual_data->query ("SELECT '$key' FROM `$upTables[$t]` WHERE stID='$sessionIDs[$id]' AND '$key'!='$value'")){
}

Thank you!

Answer 1

Something like this