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

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

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Introduction to SQL
NULL is

the same as blank for character
the same as 0 for integer and blank for character
the same as 0 for integer
not a value

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

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