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

NON-EQUIJOIN
NATURAL JOIN
EQUIJOIN
OUTER JOIN

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Introduction to SQL
Find the name of all cities with their temperature, humidity and countries.

SELECT weather.city, temperature, humidity, country FROM weather, location WHERE weather.city = location.city;
SELECT weather.city, temperature, humidity FROM weather SELECT country FROM location WHERE weather.city = location.city;
SELECT weather.city, temperature, humidity, country FROM weather, location;
SELECT city, temperature, humidity, country FROM location;

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