Introduction to SQL
What is a view?

A view is a database diagram.
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 special stored procedure executed when certain event occurs.

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

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;
None of These

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Introduction to SQL
If a query involves NOT, AND, OR with no parenthesis

AND will be evaluated first; OR will be evaluated second; NOT will be evaluated last.
NOT will be evaluated first; OR will be evaluated second; AND will be evaluated last.
The order of occurrence determines the order of evaluation.
NOT will be evaluated first; AND will be evaluated second; OR will be evaluated last.

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