Introduction to SQL
............. joins two or more tables based on a specified column value not equaling a specified column value in another table.

OUTER JOIN
NATURAL JOIN
NON-EQUIJOIN
EQUIJOIN

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

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