Introduction to SQL
Which of the following is the original purpose of SQL?

To define the data structures
To specify the syntax and semantics of SQL data definition language
All of these
To specify the syntax and semantics of SQL manipulation language

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

SELECT city, temperature, humidity, country FROM location;
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;

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