Consider the schema

Sailors(sid, sname, rating, age) with the following data

Sid	Sname	Rating	age
22	Dustin	7	45
29	Borg	1	33
31	Pathy	8	55
32	Robert	8	25
58	Raghu	10	17
64	Herald	7	35
71	Vishnu	10	16
74	King	9	35
85	Archer	3	26
84	Bob	3	64
96	Flinch	3	17

For the query

SELECT S.rating, AVG(S.age) AS avgage FROM Sailors S

Where S.age >= 18

GROUP BY S.rating

HAVING 1 < (SELECT COUNT(*) FROM Sailors S2 where S.rating = S2.rating)

The number of rows returned is