Introduction to SQL
Which of the following query finds the names of the sailors who have reserved at least one boat?

None of These
SELECT DISTINCT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;
SELECT DISTINCT s.sname FROM sailors, reserves WHERE s.sid = r.sid;
SELECT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;

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Introduction to SQL
What is a view?

None of these
A view is a virtual table which results of executing a pre-compiled query. A view is not part of the physical database schema, while the regular tables are.
A view is a database diagram.
A view is a special stored procedure executed when certain event occurs.

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

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

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