CREATE TABLE table_2850912_7 (college_junior_club_team VARCHAR, nhl_team VARCHAR)

How many college/junior/club teams are ther when nhl team is edmonton oilers?
SELECT COUNT(college_junior_club_team) FROM table_2850912_7 WHERE nhl_team = "Edmonton Oilers"
SELECT COUNT("college_junior_club_team") FROM "table_2850912_7" WHERE "Edmonton Oilers" = "nhl_team"