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Node.js - PostgreSQL - delete row where column is null

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Created by:
Dirask Admin - Marvin
1820

In this article, we would like to show you how to delete a row where the column is null in the PostgreSQL database using Node.js.

Node.js - PostgreSQL - delete row where column is null
Data used in the example - HeidiSQL

Note: at the end of this article you can find database preparation SQL queries.

const { Client } = require('pg');

const client = new Client({
    host: '127.0.0.1',
    user: 'postgres',
    database: 'database_name',
    password: 'password',
    port: 5432,
});

const deleteRowsIfNullEmail = async () => {
    const query = `DELETE FROM "users" WHERE "email" IS NULL;`;
    try {
        await client.connect();    // creates connection
        await client.query(query); // sends query
    } catch (error) {
        console.error(error.stack);
    } finally {
        await client.end();        // closes connection
    }
};

deleteRowsIfNullEmail();

Result: 

Postgres - Node.js - NULL lines in the email column have been removed - HeidiSQL
NULL lines in the email column have been removed - HeidiSQL

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', 'andrew123@email.com');

Node.js - PostgreSQL - Problems

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