yes..you need use sequence in oracle for auto increment.
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AutoIncrement In Oracle
How do I create am auto increment field in Oracle 9i.
I believe it has something to do with triggers but am unable to create or find example code.
Thank you in advance
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Answers
Yes, contrary to SQL Server where you can define an implicit sequence using the "IDENTITY" key word when creating your table, in Oracle, you need to create explicitly a sequence with the code mattdee89 gave you. But in this piece of code there are all the parameters a sequence needs. By default, a sequence starts with 1, increments by 1, doesn't cycle, doesn't compute any cache, and goes up to almost infinity.
To use it, you can either use mattdee89's answer or striaght in your query use the "mySequence.nextval" statement to increment the mySequence's value.
It would give something like this if you had a table named "myTable" with a single column named "myTableID" which shoud be incremented :
insert into myTable(myTableID) values (mySequence.nextval)
Try it ! You really do not have to use a trigger to be able to use a sequence easily.
Bye
Denis
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by: mattdee89Posted on 2002-12-01 at 16:00:40ID: 7518059
First create a sequence in the schema...
I use a 'demo' schema -->
__________________________
CREATE SEQUENCE "DEMO"."SEQ_INSERT" INCREMENT BY 1 START WITH
1780229 MAXVALUE 1.0E28 MINVALUE 1 NOCYCLE
CACHE 20 ORDER
__________________________
Next place a trigger on the column on the table that you want to auto-increment. My table is 'emp' and column is 'emp_no' -->
__________________________
CREATE OR REPLACE TRIGGER "DEMO"."TRG_EMP_INSERT" BEFORE
INSERT ON "DEMO"."EMP"
FOR EACH ROW BEGIN
SELECT seq_insert .nextval -- get the new seq number
INTO :NEW.emp_no -- :NEW missed
FROM DUAL;
END;
__________________________
If you have questions or problems, shoot me an email..
-Matt
mattdee89@hotmail.com