Answers for "alter table add multiple columns postgres"

alter table add multiple columns postgresql

ALTER TABLE customer 
ADD COLUMN fax VARCHAR,
ADD COLUMN email VARCHAR;

postgres update multiple columns

UPDATE table_name 
SET column_one = TRUE,
    column_two = 'some string',
    column_three = 558,
WHERE column_four = 'some other string'

postgres how to add field created at

CREATE TABLE my_table
(
	id serial NOT NULL,
    user_name text,
	created_at timestamp with time zone DEFAULT CURRENT_TIMESTAMP //here
)