Manual inserts on a postgres table with a primary key sequence. A table can have one and only one primary key. It is a good practice to add a primary key to every table.
Now my doubt lies on how to insert a value into a table which only attribute is both a primary and a foreign key. In this context, the admin is the first person to ever register an account. I have two local databases in one of them I have created a foreign table that is referencing a table in the second database. In psql this appears as something like this.
So, just read back the record. Thus, you cannot count on all tables having an OID column. CREATE TABLE statement). Overally, it is a FAR better thing for you to create your own primary key and not count on default behavior.
To get the last insert id from the table after inserting a new row, you use the RETURNINGclause in the INSERTstatement. One can insert a single row at a time or several rows as a result of a query. SERIAL data type allows you to automatically generate unique integer numbers (IDs, identity, auto-increment, sequence) for a column.
Subsequently, you will also need to individually recreate the foreign keys in the other tables. This article demonstrates how to add a primary key to an existing table in SQL Server using Transact-SQL.