The meaning of these relations is straightforward. Primary key attributes are underlined. Thus SID is the primary key for SAILORS, BID is the primary key for BOATS, and all three attributes of RESERVES together form the primary key of RESERVES. Arrows indicate foreign keys. Attribute NO_OF_RED records the number of reservations of red boats by a sailor. Write (a) an SQL row level trigger and (b) an SQL statement level trigger that maintain the value of attribute NO_OF_RED every time a reservation is made.