How to AUTO_INCREMENT in db2?

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You’re looking for is called an IDENTITY column:

create table student (
   sid integer not null GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1)
  ,sname varchar(30)
  ,PRIMARY KEY (sid)
);

A sequence is another option for doing this, but you need to determine which one is proper for your particular situation. Read this for more information comparing sequences to identity columns.

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