add column in table postgres code example
Example 1: postgresql add column with constraint
ALTER TABLE customers
ADD COLUMN contact_name VARCHAR NOT NULL;
Example 2: alter table add column psql
ALTER TABLE table_name
ADD column_name data_type column_constraint;
Example 3: postgresql insert column
ALTER TABLE table_name
ADD COLUMN new_column_name data_type constraint;
Example 4: 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
)