PHP Mysql如果行为空则删除

Question

I have this 4 fields on my table. p1 p2 p3 p4 gameID is the row table. So only that row should be deleted. So when it update the playe1 = '' it will delete the row table.

Note that it will delete only if the p1 p2 p3 p4 is empty.

Is my code if else correct? it update the row player1 to empty but it did not delete.

if($p1 == $email_val){
    $sql_update_player = mysql_query("UPDATE game SET player1='' WHERE gameID='$gameID' ") or die ( mysql_error() );
$stat = "1";
    if(empty($p1) and empty($p2) and empty($p3) and empty($p4) ){
        $sqlDelGame = mysql_query("DELETE FROM game WHERE gameID='$gameID'") or die ( mysql_error() );
        echo "Game deleted";
    }
}

Answer 1

if you want to delete games that dosn't have any players yet, you can run:

DELETE FROM game
WHERE player1 = ''
  AND player2 = ''
  AND player3 = ''
  AND player4 = '';