PostgreSQL Alter table add multiple columns to existing table

Add multiple columns to existing table

How to add multiple columns to existing table. Alter syntax and example.

Syntax

ALTER TABLE table_name 
ADD COLUMN column_name data_type,
ADD COLUMN column_name data_type;

Create table

CREATE TABLE users(
userid numeric not null 
default nextval('seq_users'::regclass),
username varchar(100),
userpass varchar(250),
usermail varchar(50),
address varchar(1000)  
);    

Example Add multiple columns

ALTER TABLE users 
ADD COLUMN first_name varchar(100), 
ADD COLUMN last_name varchar(100);