Introduction to SQL
A view is which of the following?

A virtual table that cannot be accessed via SQL commands
A base table that can be accessed via SQL commands
A base table that cannot be accessed via SQL commands
A virtual table that can be accessed via SQL commands

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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 COUNT(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

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