Between the stores under weather station 12, what is the percentage of item 5 sold in store 10 in 2014?
weather station 12 refers to station_nbr = 12; item 5 refers to item_nbr = 5; 10 store refers to store_nbr = 10; in 2014 refers to SUBSTR(date, 1, 4) = '2014'; percentage = Divide (Sum(units where store_nbr = 10), Sum(units)) * 100
SELECT CAST(SUM(CASE WHEN T2.store_nbr = 10 THEN units * 1 ELSE 0 END) AS REAL) * 100 / SUM(units) FROM relation AS T1 INNER JOIN sales_in_weather AS T2 ON T1.store_nbr = T2.store_nbr WHERE station_nbr = 12 AND item_nbr = 5 AND T2.`date` LIKE '%2014%'