Introduction to SQL
To define what columns should be displayed in an SQL SELECT statement:

use SELECT to name the source table(s) and list the columns to be shown after USING.
use FROM to name the source table(s) and list the columns to be shown after SELECT.
use USING to name the source table(s) and list the columns to be shown after WHER
use USING to name the source table(s) and list the columns to be shown after SELECT.

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Introduction to SQL
Find the temperature in increasing order of all cities

SELECT city, temperature FROM weather ORDER BY city;
SELECT city, temperature FROM weather;
SELECT city, temperature FROM weather ORDER BY temperature;
SELECT city FROM weather ORDER BY temperature;

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Introduction to SQL
Find the names of the countries whose condition is sunny.

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

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