On February 8, 2014, what is the minimum temperature in the station where store 29 belongs?
On February 8, 2014 refers to date = '2014-02-08'; store 29 refers to store_nbr = 29; minimum temperature refers to tmin; station refers to station_nbr
SELECT tmin FROM relation AS T1 INNER JOIN weather AS T2 ON T1.station_nbr = T2.station_nbr WHERE T1.store_nbr = 29 AND T2.`date` = '2014-02-08'