Answers for "postgresql alter table"

postgresql add column with constraint

ALTER TABLE customers 
ADD COLUMN contact_name VARCHAR NOT NULL;

Posted by: Guest on February-18-2020

postgres alter table add primary key

-- To set a column as primary key:
ALTER TABLE distributors ADD PRIMARY KEY (tablename);

Posted by: Guest on November-02-2020

alter column in table postgres

ALTER TABLE table_name
  ALTER COLUMN column_name TYPE column_definition;

Posted by: Guest on February-24-2021

postgresql insert column

ALTER TABLE table_name
ADD COLUMN new_column_name data_type constraint;

Posted by: Guest on January-26-2021

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
)

Posted by: Guest on August-25-2020

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