How many units of item no.5 were sold in store no.3 in total on days with a total precipitation of over 0.05?
item no. 5 refers to item_nbr = 5; store no.3 refers to store_nbr = 3; with a total precipitation of over 0.05 refers to preciptotal > 0.05
SELECT SUM(CASE WHEN T3.preciptotal > 0.05 THEN units ELSE 0 END) AS sum FROM sales_in_weather AS T1 INNER JOIN relation AS T2 ON T1.store_nbr = T2.store_nbr INNER JOIN weather AS T3 ON T2.station_nbr = T3.station_nbr WHERE T2.store_nbr = 3 AND T1.item_nbr = 5