Introduction to SQL
What is the meaning of LIKE '%0%0%'

Feature begins with two 0's
Feature has more than two 0's
Feature ends with two 0's
Feature has two 0's in it, at any position

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

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.
AND will be evaluated first; OR will be evaluated second; NOT will be evaluated last.

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

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