Node.js - PostgreSQL Insert data from one table to another

In this article, we would like to show you how to insert data from one table to another in the Postgres database from Node.js level.

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: 'my_username',
    database: 'my_database',
    password: 'my_password',
    port: 5432,
});

const moveFromMembersToUsers = async () => {
	const query = `    
            INSERT INTO "users" ("name", "email", "country")
            SELECT "name", "email", ''
            FROM "members";
    `;
    await client.connect();  // creates connection
    try {
        await client.query(query);  // sends query
    } finally {
        await client.end();  // closes connection
    }
};

moveFromMembersToUsers()
    .then(() => console.log('Rows moved!'))
    .catch(error => console.error(error.stack));

Result: 

Database preparation

create_tables.sql file:

CREATE TABLE "users" (
	"id" SERIAL,
	"name" VARCHAR(100),
	"email" VARCHAR(100),
	"country" VARCHAR(15),
	PRIMARY KEY ("id")
);

CREATE TABLE "members" (
	"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", "email", "country")
VALUES
    ('Tom', 'tom@email.com', 'Poland'),
    ('Chris', 'chris@email.com', 'Spain'),
    ('Jack', 'jack@email.com', 'Spain'),
    ('Kim', 'kim@email.com', 'Vietnam'),
    ('Marco', 'marco@email.com', 'Italy'),
    ('Kate', 'kate@email.com', 'Spain'),
    ('Nam', 'nam@email.com', 'Vietnam');

INSERT INTO "members"
	( "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');

Native SQL query (used in the above example):

INSERT INTO "users" ("name", "email", "country")
SELECT "name", "email", ''
FROM "members";