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PostgreSQL - find row with null value in column
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In this article, we would like to show you how to find rows with NULL value in one of the 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 the columns, we will use the following table:
Note:
At the end of this article you can find database preparation SQL queries.
Example
In this example, we will select rows from users table with NULL value in email column.
Query:
SELECT *
FROM "users"
WHERE "email" IS NULL;
Result:
Database preparation
create_tables.sql file:
CREATE TABLE "users" (
"id" SERIAL,
"name" VARCHAR(50) NOT NULL,
"surname" VARCHAR(50) NOT NULL,
"email" VARCHAR(50),
PRIMARY KEY ("id")
);
insert_data.sql 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');