For the weather station which recorded the highest temperature above the 30-year normal, how many stores does it have?
highest temperature above the 30-year normal refers to Max(depart)
SELECT store_nbr FROM relation WHERE station_nbr = ( SELECT station_nbr FROM weather ORDER BY depart DESC LIMIT 1 )
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, 
