Which station has the highest number of stores? Calculate the said station's average maximum temperature in February 2012.
station with highest number of stores refers to station_nbr where Max(Count(store_nbr)); station refers to station_nbr; in February 2012 refers to substring (date, 1, 7) = '2012-02'; average maximum temperature = Divide(Sum(tmax), 29)
SELECT CAST(SUM(T2.tmax) AS REAL) / 29 FROM ( SELECT station_nbr FROM relation GROUP BY station_nbr ORDER BY COUNT(store_nbr) DESC LIMIT 1 ) AS T1 INNER JOIN weather AS T2 ON T1.station_nbr = T2.station_nbr WHERE SUBSTR(T2.`date`, 1, 7) = '2012-02'
database name:db_id sales_in_weather
sales_in_weather table sales_in_weather Cols: date dtype date, store number dtype integer, item number dtype integer, units dtype integer, 
weather table weather Cols: station number dtype integer, date dtype date, temperature max dtype integer, temperature min dtype integer, temperature average dtype integer, departure from normal dtype integer, dew point dtype integer, wet bulb dtype integer, heat dtype integer, cool dtype integer, sunrise dtype text, sunset dtype text, code summarization dtype text, snowfall dtype real, preciptotal dtype real, station pressure dtype real, sea level dtype real, resultant speed dtype real, resultant direction dtype integer, average speed dtype real, 
relation table relation Cols: store number dtype integer, station number dtype integer, 
