Question

当我尝试编译以下Oracle代码时：

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;

它说：

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

我看不到任何错误。有人可以帮帮我吗？

Answer 1

错字：FROM FUAL应为FROM DUAL

帮我合并我的自动增量触发器

1 个答案: