postgresql alter column auto increment

PostgreSQL - How to add auto increment primary key?

1. From the data view, click on the Structure button, or press Cmd + Ctrl + ]
2. Click the + Column button, or double click on the empty row to insert a new column.
3. Name the column, use the serial datatype, and set NO value for the is_nullable field.
4. Press Cmd + S to save the changes.