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I have a table with 8440 records with a natural (string) primary key. Now I just discovered that to support a legacy client, I need the records to have integer keys as well. what’s the easiest way to add a serial INT column to this table with a unique constraint and populate it with integer values from 1 to 8440?
Alter the table, add a new not null column of type
serial, with a unique key on it.In Postgres, the serial type is a mere alias for the int type with a default value of nextval(some_sequence), the latter of which is created on the fly.