CREATE TABLE table_18790 ("City of license /Market" TEXT, "Station" TEXT, "Channel TV  (  DT  ) " TEXT, "Owned since" TEXT, "Primary affiliation" TEXT)

What channel has station kdfw ++?
SELECT "Channel TV ( DT )" FROM table_18790 WHERE "Station" = 'KDFW ++'
SELECT "Channel TV ( DT )" FROM "table_18790" WHERE "Station" = 'KDFW ++'