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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:
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SELECT *2
FROM "table_name" 3
WHERE "column_name" IS NULL;Sometimes your data can be an empty string. You can select such rows with the below query:
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SELECT FROM "table_name" WHERE "column_name" = '';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.
In this example, we will select rows from users table with NULL value in email column.
Query:
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SELECT * 2
FROM "users"3
WHERE "email" IS NULL;Result:
create_tables.sql file:
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CREATE TABLE "users" (2
"id" SERIAL,3
"name" VARCHAR(50) NOT NULL,4
"surname" VARCHAR(50) NOT NULL,5
"email" VARCHAR(50),6
PRIMARY KEY ("id")7
);insert_data.sql file:
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INSERT INTO "users"2
( "name", "surname", "email")3
VALUES4
('John', 'Stewart', 'john@email.com'),5
('Chris', 'Brown', NULL),6
('Kate', 'Lewis', NULL),7
('Ailisa', 'Gomez', 'ailisa@email.com'),8
('Gwendolyn', 'James', NULL),9
('Simon', 'Collins', NULL),10
('Taylor', 'Martin', NULL),11
('Andrew', 'Thompson', 'andrew@email.com');