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PostgreSQL - Delete query

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Created by:

Brian-Tompset

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In this article, we would like to show you how to make DELETE query in PostgreSQL.

Quick solution:

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DELETE FROM "table_name"
WHERE "column_name" = some_value;

Note:

where some_value is either a number or a string wrapped with single quotation marks ''.

Practical example

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To show how DELETE statement works, we will use the following table:

PostgreSQL - example data used with DELETE statement

Note:

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

Example 1

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In this example, we will delete user whose id = 8.

Query:

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DELETE FROM "users"
WHERE "id" = 8;

Result:

Example 2

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In this example, we will delete user whose name = John.

Query:

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DELETE FROM "users"
WHERE "name" = 'John';

Result:

Database preparation

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create_tables.sql file:

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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:

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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');