Introduction to SQL
Which of the SQL statements is correct?

SELECT Username, Password FROM Users
SELECT Username, Password WHERE Username = 'user1'
SELECT Username AND Password FROM Users
None of these

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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 AND r.bid = 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
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
NULL is

the same as blank for character
the same as 0 for integer
not a value
the same as 0 for integer and blank for character

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