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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Introduction to SQL
Which of the following query finds colors of boats reserved by "Dustin"?

SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND r.bid = b.bid
SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND s.sid = r.sid
SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND s.sid = r.sid AND r.bid = b.bid;
SELECT DISTINCT b.color FROM boats b, sailors s WHERE s.sname = 'Dustin' AND s.sid = b.sid

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Introduction to SQL
In an SQL SELECT statement querying a single table, according to the SQL-92 standard the asterisk (*) means that:

None of these
all records meeting the full criteria are to be returned.
all records with even partial criteria met are to be returned.
all columns of the table are to be returned.

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