Question

When I try to compile the following Oracle code:

CREATE TABLE authors (
    id NUMBER PRIMARY KEY, /* what if two authors have the same name! */
    name VARCHAR2(200) NOT NULL
);
/* autoinrement sequence */
CREATE SEQUENCE authors_id_seq START WITH 1 INCREMENT BY 1;
/* trigger run before every insert into authors table - copies MySQL autoincrement */
CREATE TRIGGER authors_insert_trg BEFORE INSERT ON authors 
FOR EACH ROW WHEN (new.id IS NULL)
BEGIN
  SELECT authors_id_seq.nextval INTO :new.id FROM FUAL;
END;

It says:

table AUTHORS created.
sequence AUTHORS_ID_SEQ created.
TRIGGER authors_insert_trg compiled
Warning: execution completed with warning

I cannot see any error. Could somebody please help me out?

Answer 1

Typo: FROM FUAL should be FROM DUAL