Auto-increment primary

Question

I am new to oracle db
Does anybody tell me how to make my primary key as a DBSequence type and automate increment one by one?
below is my table structure
CREATE TABLE CUSTOMER(
CUSTOMER_ID NUMBER(10) NOT NULL,
CUSTOMER_NUMBER NUMBER(20) NOT NULL,
CUSTOMER_NAME VARCHAR2(50) NOT NULL,
CONSTRAINT PK_CUSTOMER PRIMARY KEY (CUSTOMER_ID)
What I want is every time I insert new row into table
the CUSTOMER_ID will be automatically increased one by one.
thanks a lot

Answer 1

From http://www.ddbcinc.com/askddbc/topic.asp?TOPIC_ID=239
CREATE TABLE ab (
  ab_id  NUMBER PRIMARY KEY,
  bf_id  VARCHAR2(8),
  fs_id  VARCHAR2(8)
CREATE SEQUENCE ab_seq
  START WITH 1
  INCREMENT BY 1
  CACHE 100;
CREATE OR REPLACE TRIGGER ab_preinsert
BEFORE INSERT ON ab
FOR EACH ROW
BEGIN
  SELECT ab_seq.nextval
    INTO :new.ab_id
    FROM dual;
END;Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC