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Node.js - PostgreSQL - delete row where column is empty string (blank)

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Created by:

Nabila-Burnett

385

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

Node.js - PostgreSQL - delete row where column is empty string (blank) — Data used in the example - HeidiSQL

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

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const { Client } = require('pg');
​
const client = new Client({
    host: '127.0.0.1',
    user: 'postgres',
    database: 'database_name',
    password: 'password',
    port: 5432,
});
​
const deleteRows = async (text) => {
    const query = `DELETE FROM "users" WHERE "email" = $1;`;
    try {
        await client.connect();  // creates connection
        await client.query(query, [text]); // sends query
    } catch (error) {
        console.error(error.stack);
    } finally {
        await client.end();      // closes connection
    }
};
​
deleteRows('');  // delete row where column is empty string ''

Result:

Postgres - Node.js - Rows with a blank column have been removed - HeidiSQL — Rows with a blank column have been removed - HeidiSQL

Database preparation

Edit

create_tables.sql file:

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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:

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INSERT INTO "users"
    ( "name", "surname", "email")
VALUES
    ('John', 'Stewart', 'john@email.com'),
    ('Chris', 'Brown', ''),
    ('Kate', 'Lewis',''),
    ('Ailisa', 'Gomez', 'ailisa@email.com'),
    ('Gwendolyn', 'James', ''),
    ('Simon', 'Collins', ''),
    ('Taylor', 'Martin',''),
    ('Andrew', 'Thompson', 'andrew123@email.com');