a. What is the result of this query: SELECT AVG (S.rating) FROM Sailors S b. What is the result of this query: SELECT COUNT (S.rating) FROM Sailors S c. Show the full outer join of S with itself, with the join condition being sid=sid .

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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a. What is the result of this query:
SELECT AVG (S.rating)
FROM Sailors S


b. What is the result of this query:
SELECT COUNT (S.rating)
FROM Sailors S


c. Show the full outer join of S with itself, with the join condition being sid=sid .

sid
sname
18 jones 3
41
jonah
6
22
ahab
7
63
moby
null
rating
age
30.0
56.0
44.0
15.0
Transcribed Image Text:sid sname 18 jones 3 41 jonah 6 22 ahab 7 63 moby null rating age 30.0 56.0 44.0 15.0
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