CREATE TABLE table_name_6 (est VARCHAR, city VARCHAR, state_province VARCHAR, league VARCHAR)

In what year was the cfl team in edmonton, alberta established?
SELECT est FROM table_name_6 WHERE state_province = "alberta" AND league = "cfl" AND city = "edmonton"
SELECT "est" FROM "table_name_6" WHERE "alberta" = "state_province" AND "cfl" = "league" AND "city" = "edmonton"