date1=yearStart(year)

	date2=yearStart(year+1)

	query="""select country_code,sum(player_count) from tournaments where datum>=date(?) and datum<date(?) group by country_code"""

	return cursor.execute(query,(date1,date2))

def tournamentAttendance(year1,year2):

	res=dict()

	for year in range(year1,year2):

		records=_tournamentAttendance(year)

		for (country,attendance) in records:

			if country not in res:

				res[country]=dict()

			res[country][year]=attendance

		print("\r",year,end="",file=sys.stderr)

	print("\r",end="",file=sys.stderr)

	print("Návštěvnosti (počty hráčů) na turnajích podle let")

	print("kód země\t"+"\t".join(str(y) for y in range(year1,year2)))

	for country in sorted(res.keys()):

		print(country,end="\t")

		print("\t".join(str(res[country].get(y,0)) for y in range(year1,year2)))

def fetchByRating(strongerThan,country=""):

	"""Hráči, kteří dosáhli rating strongerThan nebo vyšší, nepovinně filtrovaní podle země, seřazení od nejlepšího dosaženého ratingu."""

	query="""

		select pin,name,max(rating_after) as max_rating

			from players_performance natural join players

			where rating_after>=? and (?='' or country_code=?)

			group by pin

			order by max_rating desc"""

	res=cursor.execute(query,(strongerThan,country,country))

	print("pin\tjméno\tmax rating")

	for rec in res:

		print("\t".join([str(x) for x in rec]))

def timeToPeak():

	"""Jakého hráči dosáhli maximálního ratingu a jak dlouho jim to trvalo.

	Uvažuje hráče začínající s ratingem<=600 a s vrcholem před 1.1.2017."""

	# join on pin, max_rating může duplikovat řádky, když měl hráč stejný max_rating vícekrát.

	# proto ten ošklivý vnější group by :-ú

	query="""

			from players_performance_tournaments as ppt

				join (select pin,min(rating_before) as min_rating,max(rating_after) as max_rating,min(datum) as _min_datum from players_performance_tournaments group by pin having min_rating<=600) as subq on ppt.pin=subq.pin and ppt.rating_after=max_rating

			group by ppt.pin

			having peak_datum<date('2017-01-01')

	"""

	res=cursor.execute(query)

	print("pin\tmin rating\tmax rating\tprvní turnaj\tdosažení max ratingu\troky k max ratingu")

	for rec in res:

		print("\t".join([str(x) for x in rec]))

# playerYear("Kotowski Jaroslav",2017)

# timeRank(2017,"CZ")

# yearsByCountry(2001,2018)

# populationStrength(2001,2018,"RU")

# populationAge(2001,2018,"RU")

# tournamentAttendance(2001,2018)

# fetchByRating(2600,"CZ")

# timeToPeak()