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PostgreSQL - find row with null value in column

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Created by:
Tehya-Blanchard
304

In this article, we would like to show you how to find rows with NULL value in one of theĀ columns in PostgreSQL.

Quick solution:

SELECT *
FROM "table_name" 
WHERE "column_name" IS NULL;

Sometimes your data can be an empty string. You can select such rows with the below query:

SELECT FROM "table_name" WHERE "column_name" = '';

Practical example

To show how to find rows with NULL value in one of theĀ columns, we will use the following table:

PostgreSQL - select rows with NULL values - example data
PostgreSQL - select rows with NULL values - example data

Note:

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

Example

In this example, we will select rows fromĀ usersĀ table with NULL value inĀ emailĀ column.

Query:

SELECT * 
FROM "users"
WHERE "email" IS NULL;

Result:

PostgreSQL - select rows with NULL column values - result
PostgreSQL - select rows with NULL column values - result

Database preparation

create_tables.sqlĀ file:

CREATE TABLE "users" (
	"id" SERIAL,
	"name" VARCHAR(50) NOT NULL,
	"surname" VARCHAR(50) NOT NULL,
	"email" VARCHAR(50),
	PRIMARY KEY ("id")
);

insert_data.sqlĀ file:

INSERT INTO "users"
	( "name", "surname", "email")
VALUES
	('John', 'Stewart', 'john@email.com'),
	('Chris', 'Brown', NULL),
	('Kate', 'Lewis', NULL),
	('Ailisa', 'Gomez', 'ailisa@email.com'),
	('Gwendolyn', 'James', NULL),
	('Simon', 'Collins', NULL),
	('Taylor', 'Martin', NULL),
	('Andrew', 'Thompson', 'andrew@email.com');

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PostgreSQL - find row with null value in column
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