CREATE TABLE table_name_15 (school_club_team VARCHAR2, round VARCHAR2, player VARCHAR2)

Which School/Club Team has a Round larger than 3, and a Player of sammy okpro?
SELECT school_club_team FROM table_name_15 WHERE round > 3 AND player = "sammy okpro"
SELECT "school_club_team" FROM "table_name_15" WHERE "player" = "sammy okpro" AND "round" > 3