Help-how can i see the sequence in the table?

Question

Hi, i created sequence for the table. but how can i view the sequence as a column in the table? like the sequence started with 1 and increment by 1. how can i make it available as a column in the table? thanks a lot for anyone's prompt reply. much appreciated.

Answer 1

eg.
Create table:
create table t1 (
id number(10),
col1 varchar(2)
Create sequence:
CREATE SEQUENCE "PEMARTEN"."T1_ID" NOCYCLE NOORDER CACHE 20 NOMAXVALUE MINVALUE 1 INCREMENT BY 1 START WITH 1
You can do 2 things:
Use the sequence in your insert query:
eg.
insert into t1 (id, col1) values (t1_id.nextval, 'example');
OR
Create a before insert trigger (prefered):
CREATE OR REPLACE TRIGGER "PEMARTEN"."BI_T1" BEFORE INSERT ON "PEMARTEN"."T1"
REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
DECLARE
new_id number;
BEGIN
SELECT t1_id.nextval
INTO new_id
FROM dual;
:new.id := new_id;
END;
Now you can just insert data:
insert into t1 (col1) values ('example');
sequence.nextval increments the sequence and returns the next value
sequence.currval returns the current value of a sequence
I hope that helps.
Kind regards,
Pieter