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PostgreSQL - ROUND() function example

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In this article, we would like to show you how to use ROUND() function in PostgreSQL.

Quick solution:

SELECT ROUND(number, decimals);

Practical example

Simple example

In this example, we will show you how to simply round a number to four decimal places using ROUND() function.

Query:

SELECT ROUND(100.12345, 4);

Output:

100.1235

 

To show more complex example of how the ROUND() function works, we will use the following table:

PostgreSQL - example data used with ROUND() function
PostgreSQL - example data used with ROUND() function

Note:

At the end of this article you can find database preparation SQL queries.

Example 1

In this example, we will round the salary column to 0 decimal places.

Query:

SELECT ROUND("salary", 0)
FROM "users";

Output:

PostgreSQL - ROUND() function result
PostgreSQL - ROUND() function result

Example 2

In this example, we will display the average salary rounded to 2 decimal places.

PostgreSQL - average salary example
PostgreSQL - average salary example

Query:

SELECT ROUND(AVG("salary"), 2)
FROM "users";

Output:

PostgreSQL - ROUND() function result
PostgreSQL - ROUND() function result

Database preparation

create_tables.sql file:

CREATE TABLE "users" (
	"id" SERIAL,
	"name" VARCHAR(50) NOT NULL,
	"surname" VARCHAR(50) NOT NULL,
	"department_id" INTEGER,
    "salary" DECIMAL(15,2) NOT NULL,
	PRIMARY KEY ("id")
);

insert_data.sql file:

INSERT INTO "users"
	( "name", "surname", "department_id", "salary")
VALUES
	('John', 'Stewart', 1, '3512.00'),
	('Chris', 'Brown', 2, '1344.00'),
	('Kate', 'Lewis', 3, '6574.00'),
	('Ailisa', 'Gomez', NULL, '6500.00'),
	('Gwendolyn', 'James', 2, '4200.00'),
	('Simon', 'Collins', 4, '3320.00'),
	('Taylor', 'Martin', 2, '1500.00'),
	('Andrew', 'Thompson', NULL, '2100.00');

PostgreSQL - Functions

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