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PostgreSQL - MAX() function example

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Created by:
Haris65
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In this article, we would like to show you how to use MAX() function in PostgreSQL.

Quick solution:

SELECT MAX("column_name") FROM "table_name";

Practical example

To show how the MAX() function works, we will use the following table:

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

Note:

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

Example

In this example, we will display the largest salary value.

Query:

SELECT MAX("salary") AS "maximum salary" FROM "users";

Output:

PostgreSQL - MAX() function result
PostgreSQL - MAX() 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');
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PostgreSQL - Functions

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