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

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

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Introduction to SQL
Find the names of these cities with temperature and condition whose condition is neither sunny nor cloudy

SELECT city, temperature, condition FROM weather WHERE condition BETWEEN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition NOT BETWEEN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition IN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition NOT IN ('sunny', 'cloudy');

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Introduction to SQL
Find the names of the countries whose condition is sunny.

SELECT country FROM location WHERE city UNION (SELECT city FROM weather WHERE condition = 'sunny');
SELECT country FROM location WHERE condition = 'sunny';
SELECT country FROM location WHERE city IN (SELECT city FROM weather WHERE condition = sunny');
SELECT country FROM location WHERE city NOT IN (SELECT city FROM weather WHERE condition = 'sunny');

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