CREATE TABLE table_18123 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Results" TEXT, "Candidates" TEXT)

How many party were listed for district oklahoma 5?
SELECT COUNT("Party") FROM table_18123 WHERE "District" = 'Oklahoma 5'
SELECT COUNT("Party") FROM "table_18123" WHERE "District" = 'Oklahoma 5'