Just need a fresh pair of eyes. I really can't see the parse error so if anyone wants to look over it and point out the missing , or ' I'd be grateful.
$update job_database= "INSERT INTO " . $Table . " VALUES('" . $_POST['username'] . "',',','" . $_POST['job_cat'] . "','" . $_POST['job_details'] . "','" . date('Y-m-d') . "','No')";