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