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

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

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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;
c) SELECT COUNT(s.rating) FROM sailors s, reserves r WHERE s.sid = r.sid 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

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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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