PostgreSQL - count rows with NULL values

In this article, we would like to show you how to count rows with NULL values in PostgreSQL.

Quick solution:

SELECT COUNT(*) AS "alias_name"
FROM "table_name"
WHERE "column_name" IS NULL;

Practical example

To show you how to count rows with NULL values, we will use the following users table:

Note:

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

Example

In this example, we will count the number of rows with NULL values in department_id column.

Query

SELECT COUNT(*) AS "NULL_values_in_column"
FROM "users"
WHERE "department_id" IS NULL;

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, '6000'),
	('Chris', 'Brown', 2, '6000'),
	('Kate', 'Lewis', 3, '4000'),
	('Ailisa', 'Gomez', NULL, '4000'),
	('Gwendolyn', 'James', NULL, '4000'),
	('Simon', 'Collins', 4, '4000'),
	('Taylor', 'Martin', 2, '2000'),
	('Andrew', 'Thompson', NULL, '2000');