cursor.execute("""create table players_performance (pin integer references players(pin), tournament_code text references tournaments(code), country_code text, club text, win_count integer, game_count integer, rating_before real, rating_after real, primary key (pin,tournament_code))""")

	cursor.execute("""

		create view players_performance_tournaments (pin,p_country_code,rating_before,rating_after,t_country_code,datum) as

			select pin,pp.country_code,rating_before,rating_after,ts.country_code,datum

				from players_performance as pp join tournaments as ts on pp.tournament_code=ts.code

	""")

	cursor.execute("""create index pp_pin on players_performance (pin)""")

	cursor.execute("""create index pp_tournament_code on players_performance (tournament_code)""")

	cursor.execute("""create index pp_country_ind on players_performance (country_code)""")

	cursor.execute("""create index t_datum_ind on tournaments (datum)""")

	connection.commit()

def fillDB(tournaments,players):

	cursor=connection.cursor()

	cursor.execute("""delete from players_performance""")

	cursor.execute("""delete from players""")

	cursor.execute("""delete from tournaments""")

	cursor.executemany(