CREATE TABLE Project_Staff (role_code VARCHAR, date_from VARCHAR, date_to VARCHAR)

What are the staff roles of the staff who
SELECT role_code FROM Project_Staff WHERE date_from > '2003-04-19 15:06:20' AND date_to < '2016-03-15 00:33:18'
SELECT "role_code" FROM "Project_Staff" WHERE "date_from" > '2003-04-19 15:06:20' AND "date_to" < '2016-03-15 00:33:18'