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, reserves WHERE s.sid = r.sid;
SELECT DISTINCT s.sname FROM sailors s, reserves r 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
The wildcard in a WHERE clause is useful when?

An exact match is not possible in a CREATE statement.
An exact match is not possible in a SELECT statement.
An exact match is necessary in a SELECT statement.
An exact match is necessary in a CREATE statement.

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Introduction to SQL
Find the names of the countries whose condition is sunny.

SELECT country FROM location WHERE condition = 'sunny';
SELECT country FROM location WHERE city IN (SELECT city FROM weather WHERE condition = sunny');
SELECT country FROM location WHERE city UNION (SELECT city FROM weather WHERE condition = 'sunny');
SELECT country FROM location WHERE city NOT IN (SELECT city FROM weather WHERE condition = 'sunny');

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