Introduction to SQL
When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

Both IN and NOT IN.
LIKE only.
IN only.
NOT IN only.

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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 city NOT IN (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');

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Introduction to SQL
The wildcard in a WHERE clause is useful when?

An exact match is not possible in a SELECT statement.
An exact match is not possible in a CREATE statement.
An exact match is necessary in a CREATE statement.
An exact match is necessary in a SELECT statement.

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Introduction to SQL
Find the name of those cities with temperature and condition whose condition is either sunny or cloudy but temperature must be greater than 70oF.

SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' OR condition = 'cloudy' AND temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' AND condition = 'cloudy' OR temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' OR condition = 'cloudy' OR temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' AND condition = 'cloudy' AND temperature > 70;

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