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

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

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Introduction to SQL
The HAVING clause does which of the following?

Acts like a WHERE clause but is used for rows rather than columns.
Acts EXACTLY like a WHERE clause.
Acts like a WHERE clause but is used for columns rather than groups.
Acts like a WHERE clause but is used for groups rather than rows.

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