CREATE TABLE table_name_98 (mac_os_x VARCHAR, haiku VARCHAR, client VARCHAR)

Which Mac OSX had no haiku and a client that was dc++?
SELECT mac_os_x FROM table_name_98 WHERE haiku = "no" AND client = "dc++"
SELECT "mac_os_x" FROM "table_name_98" WHERE "client" = "dc++" AND "haiku" = "no"