FixleR, можно тип так
$sql = "UPDATE `artist` SET `count_album` = `count_album` + 1 WHERE `id` = 1; UPDATE `artist` SET `count_album` = `count_album` - 1 WHERE `id` = 2;";
mysql_query($sql); FixleR, можно тип так
$sql = "UPDATE `artist` SET `count_album` = `count_album` + 1 WHERE `id` = 1; UPDATE `artist` SET `count_album` = `count_album` - 1 WHERE `id` = 2;";
mysql_query($sql);