OR Operator

In PostgreSQL, a boolean value can have one of three values: true, false, and null.

	Result
true	true
t	true
'true'	true
'y'	true
'yes'	true
'1'	true
false	false
f	false
'false'	false
'n'	false
'no'	false
'0'	false

Postgres OR Operator Query Results

SELECT true OR true AS result;	true
SELECT true OR false AS result;	t
SELECT true OR null AS result;	t
SELECT false OR false AS result;	f
SELECT false OR null AS result;	null
SELECT false OR false AS result;	f
SELECT null OR null AS result;	null

Using the OR operator in the WHERE clause

The following example uses the OR operator in the WHERE clause to find the films that have a rental rate is 0.99 or 2.99

SELECT
  title,
  rental_rate
FROM
  film
WHERE
  rental_rate = 0.99 OR
  rental_rate = 2.99;

Output:

title            | rental_rate
-----------------------------+-------------
 Academy Dinosaur            |        0.99
 Adaptation Holes            |        2.99
 Affair Prejudice            |        2.99
 African Egg                 |        2.99
...