PostgreSQL And – Or

AND returns query rows if both conditions are true.
OR returns query rows if at least one of the conditions is true.

And – Or syntax

SELECT * FROM table_name WHERE condition AND condition;

SELECT * FROM table_name WHERE condition OR condition;

SELECT * FROM table_name WHERE condition AND condition OR condition;

And – Or example

Goods table

id	good_type	name	description	price	insert_date
1	A	Car_1	Car 1 description	100	2018-07-21 08:45:57.311809
2	A	Car_2	Car 2 description	200	2018-07-21 08:45:57.311809
3	A	Car_3	Car 3 description	100	2018-07-21 08:45:57.311809
4	B	Boat_4	Boat 4 description	500	2018-07-21 08:45:57.311809
5	B	Boat_5	Boat 5 description	300	2018-07-21 08:45:57.311809
6	C	Train_1	Train 123 description	800	2018-07-21 08:45:57.311809

SELECT * FROM goods WHERE good_type = 'A' and price=100;

Result

id	good_type	name	description	price	insert_date
1	A	Car_1	Car 1 description	100	2018-07-21 08:45:57.311809
3	A	Car_3	Car 3 description	100	2018-07-21 08:45:57.311809

SELECT * FROM goods WHERE good_type = 'C' or price=300;

Result

id	good_type	name	description	price	insert_date
5	B	Boat_5	Boat 5 description	300	2018-07-21 08:45:57.311809
6	C	Train_1	Train 123 description	800	2018-07-21 08:45:57.311809