Introduction to SQL
Find the name of all cities with their temperature, humidity and countries.

SELECT weather.city, temperature, humidity FROM weather SELECT country FROM location WHERE weather.city = location.city;
SELECT city, temperature, humidity, country FROM location;
SELECT weather.city, temperature, humidity, country FROM weather, location;
SELECT weather.city, temperature, humidity, country FROM weather, location WHERE weather.city = location.city;

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

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 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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