Comments on: Creating BETTER auto-increment columns in Oracle

By: Earl Ruby

Earl Ruby — Fri, 27 Aug 2010 00:09:41 +0000

Hawa: I don’t use TOAD, but I’d guess it wants the starting sequence value. Try entering “1″ and see what happens.

By: Earl Ruby

Earl Ruby — Thu, 26 Aug 2010 23:58:54 +0000

Frank: I was referring specifically to the typical MySQL auto_increment and Postgres “SET DEFAULT NEXTVAL(’some_sequence’)” usage, which is also the typical way that you implement an auto-increment sequence in Oracle. In all three cases the sequence will fail to insert a new record if the ID already exists.

You could definitely implement this as a trigger in Postgres.

By: hawa

hawa — Wed, 25 Aug 2010 02:12:50 +0000

eloo..
i got problem..i run sequence code are created..but when i want to create trigger in TOAD he prompt me to insert value??
what value should i put in dialog box..tq

By: pellicle

pellicle — Thu, 19 Aug 2010 00:48:09 +0000

very useful, thanks for your succinct post here.

By: Frank

Frank — Mon, 16 Aug 2010 06:39:10 +0000

Why would PostgreSQL fail in this situation? You can create (almost) the same trigger and function in plpgsql to do exactly the same trick as you do in Oracle.

By: Earl Ruby

Earl Ruby — Fri, 30 Apr 2010 23:53:46 +0000

If you want to force Oracle to use a particular tablespace for your index then yes, it’s necessary.

If you don’t care what tablespace Oracle sticks your index into then you can leave that part off.

By: Eduardo F. Sandino

Eduardo F. Sandino — Thu, 29 Apr 2010 18:38:20 +0000

Hi Earl, first of all thanks for your article…

Just i have one question.
Is really necesary to put “using index tablespace INDX” the tablespace when we are defining the index ?

By: Earl Ruby

Earl Ruby — Sat, 10 Apr 2010 18:52:11 +0000

That’s actually three questions.

:new represents the new record, so :new.id is the id field of the new record that you’re inserting.

See http://www.dba-oracle.com/sql/t_dual_table.htm for more info.

By: SJari

SJari — Fri, 09 Apr 2010 11:43:38 +0000

I have just one question?

create or replace trigger example_insert
before insert on example
for each row
begin
select example_id_seq.nextval into :new.id from dual;
end;

what is new.id ???
what is dual ???

what do they present, and how do I modify them to my need (just out of curiosity)?

By: SJari

SJari — Fri, 09 Apr 2010 10:59:20 +0000

Thanks allot

as Oracle is new for me ( coming from MySQL) I have to say that I’m amazed that Oracle did not have such function!

but Thanks allot you just made my day

cheers