Introduction to SQL
How to select all data from student table starting the name from letter 'r'?

SELECT * FROM student WHERE name LIKE '%r%';
SELECT * FROM student WHERE name LIKE '_r%';
SELECT * FROM student WHERE name LIKE '%r';
SELECT * FROM student WHERE name LIKE 'r%';

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Introduction to SQL
Find the names of these cities with temperature and condition whose condition is neither sunny nor cloudy

SELECT city, temperature, condition FROM weather WHERE condition NOT BETWEEN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition BETWEEN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition NOT IN ('sunny', 'cloudy');
SELECT city, temperature, condition FROM weather WHERE condition IN ('sunny', 'cloudy');

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

use FROM to name the source table(s) and list the columns to be shown after SELECT.
use SELECT to name the source table(s) and list the columns to be shown after USING.
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 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 UNION (SELECT city FROM weather WHERE condition = 'sunny');
SELECT country FROM location WHERE condition = 'sunny';
SELECT country FROM location WHERE city IN (SELECT city FROM weather WHERE condition = sunny');

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