Introduction to SQL
If a query involves NOT, AND, OR with no parenthesis

NOT will be evaluated first; OR will be evaluated second; AND will be evaluated last.
AND will be evaluated first; OR will be evaluated second; NOT will be evaluated last.
NOT will be evaluated first; AND will be evaluated second; OR will be evaluated last.
The order of occurrence determines the order of evaluation.

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Introduction to SQL
Which of the following query finds the total rating of the sailors who have reserved boat "103"?

c) SELECT COUNT(s.rating) FROM sailors s, reserves r WHERE s.sid = r.sid AND r.bid = 103
SELECT s.rating FROM sailors s, reserves r WHERE s.sid = r.sid AND r.bid = 103
SELECT SUM(s.rating) FROM sailors s, reserves r WHERE s.sid = r.sid AND r.bid = 103
SELECT SUM(s.rating) FROM sailors s, reserves r AND r.bid = 103;

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