Difference between serial,sequence and OID

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Hi..
Am new to postgresql. I need to know the difference clear between serial,sequence and OID with simple example. It seems all are same to me,need help

Posted 21-Jan-13 2:24am

Priyaaammu

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Bernhard Hiller · Answer 1 · 2013-01-21T21:40:00

These items are used for automatically generating ID numbers.
In old style database (e.g. Oracle), you define the ID column as a number, create a sequence, and a trigger which links the ID column of the table with the sequence such that the column gets the next value from the sequence when a new row is inserted.
With Postgres, you define the ID column as a "serial", and Postgres magically creates the sequence and the trigger for you.