Q4. (14 points, 7 points each) Consider the Sailors-Boats-Reserves database described below.
Sailors (sid: integer, sname: string, rating: integer, age: real)
Boats (bid: integer, bname: string, color: string)
Reserves (sid: integer, bid: integer, day: date)
Write each of the following queries in SQL.
1. Find the names and ages of sailors who have reserved at least two boats.
2. For each boat reserved by at least 2 distinct sailors, find the boat id and the average age of sailors who reserved it.