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

LIKE only.
IN only.
Both IN and NOT IN.
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 IN (SELECT city FROM weather WHERE condition = 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';

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