Modify the previous question by adding the city factor. Consider only trips between stations s1 and s2 where both stations are in the same city. Also, for the average and maximum stats consider only trips between stations in the same city that is displayed in a particular row (e.g., the first seven rows in the result below show stats for the city of Mountain View). To simplify the query, discard stations with no trips (i.e., trip count =0). Keep only stations with 15 trips or less.
