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Node.js - PostgreSQL ALTER TABLE - Drop column
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In this article, we would like to show you how to drop a column to the existing table by ALTER TABLE in the Postgres database using Node.js.
Note: at the end of this article you can find database preparation SQL queries.
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const { Client } = require('pg');2
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const client = new Client({4
host: '127.0.0.1',5
user: 'postgres',6
database: 'database_name',7
password: 'password',8
port: 5432,9
});10
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const DropColumn = async () => {12
const query = `ALTER TABLE "users"13
DROP COLUMN IF EXISTS "department_id";`;14
try {15
await client.connect(); // gets connection16
await client.query(query); // sends query17
} catch (error) {18
console.error(error.stack);19
} finally {20
await client.end(); // closes connection21
}22
};23
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DropColumn();Result:
Note:
If we want to delete a column that does not exist, PostgreSQL will display an error. To be prepared for this and only remove the column if it exists, add
IF EXISTS, then PostgreSQL will issue only a notice.
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
"department_id" INTEGER,6
"salary" DECIMAL(15,2) NOT NULL,7
PRIMARY KEY ("id")8
);insert_data.sql file:
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INSERT INTO "users"2
( "name", "surname", "department_id", "salary")3
VALUES4
('John', 'Stewart', 1, '3512.00'),5
('Chris', 'Brown', 2, '1344.00'),6
('Kate', 'Lewis', 3, '6574.00'),7
('Ailisa', 'Gomez', NULL, '6500.00'),8
('Gwendolyn', 'James', 2, '4200.00'),9
('Simon', 'Cousersllins', 4, '3320.00'),10
('Taylor', 'Martin', 2, '1500.00'),11
('Andrew', 'Thompson', NULL, '2100.00');Native SQL query (used in the above example):
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ALTER TABLE "users"2
DROP COLUMN IF EXISTS "department_id"