//This will select users that have username either "ratajs" or "admin" or that have username "RatajS"

$ssql->read("users", $ssql->cond()->eq("username", ["ratajs", "admin"])->eq("nickname", ["RatajS"], SQ::COND_OR));

$ssql->read("users", $ssql->cond()->eq("username", ["admin"])->not());

//It can also add another condition, this will select user that don’t have any nickname and with username other that "admin" or "root".