Introduction to SQL
Which of the following query finds the name of the sailors who have reserved at least two boats?

SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid <> r2.bid
All of these
SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid ≠ r2.bid
SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND COUNT(r1.bid) > r2.bid

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

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

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Introduction to SQL
Find the name of cities with all entries whose temperature is in the range of 71 and 89

SELECT * FROM weather WHERE temperature NOT IN (71 to 89);
SELECT * FROM weather WHERE temperature NOT IN (71 and 89);
SELECT * FROM weather WHERE temperature BETWEEN 71 AND 89;
SELECT * FROM weather WHERE temperature NOT BETWEEN 71 to 89;

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Introduction to SQL
The HAVING clause does which of the following?

Acts like a WHERE clause but is used for rows rather than columns.
Acts like a WHERE clause but is used for groups rather than rows.
Acts like a WHERE clause but is used for columns rather than groups.
Acts EXACTLY like a WHERE clause.

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