In March 2014, which weather stations recorded the highest number of days whose temperature is below the 30-year normal?
in March 2014 refers to substring (date, 1, 4) = '2014' and substring (date, 6, 2) = '03'; temperature is below the 30-year normal refers to depart < 0; highest number of days refers to Max(Count(date))
SELECT station_nbr FROM weather WHERE SUBSTR(`date`, 1, 4) = '2014' AND SUBSTR(`date`, 6, 2) = '03' AND depart < 0 GROUP BY station_nbr HAVING COUNT(DISTINCT `date`) = ( SELECT COUNT(DISTINCT `date`) FROM weather WHERE SUBSTR(`date`, 1, 4) = '2014' AND SUBSTR(`date`, 6, 2) = '03' AND depart < 0 GROUP BY station_nbr ORDER BY COUNT(`date`) 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, 
