SQL-PL觸發器編譯錯誤

Question

我正在嘗試創建一個觸發器，當我們從 nm_employees 表中刪除值時，它會將值輸入到表中。 我已經編寫了觸發器，但是我收到了 PL 語句的編譯錯誤。 有任何想法嗎？

CREATE TABLE nm_departments(
dept2 varchar(20),
CONSTRAINT empPK PRIMARY KEY (dept2)
);

CREATE TABLE nm_employees(
name varchar(20),
dept varchar(20),
CONSTRAINT departments FOREIGN KEY (dept) REFERENCES nm_departments (dept2)ON DELETE     CASCADE
);

CREATE TABLE terminated_employees(
te_name varchar(20),
te_dept varchar(20)
);

CREATE OR REPLACE TRIGGER DeleteCustomer
BEFORE DELETE ON nm_employees
FOR EACH ROW
BEGIN
INSERT INTO terminated_employees (te_name,te_dept)
VALUES(:Old.te_name, :Old.te_dept);
END DeleteCustomer;

Answer 1

這將編譯，如果您在 *nm_employees* 上編寫觸發器，那么這將是您必須編寫的代碼

 CREATE TABLE nm_departments(
    dept2 varchar(20),
    CONSTRAINT empPK PRIMARY KEY (dept2)
    );

CREATE TABLE nm_employees(
name varchar(20),
dept varchar(20),
CONSTRAINT departments FOREIGN KEY (dept) REFERENCES nm_departments (dept2)ON DELETE     CASCADE
);

CREATE TABLE terminated_employees(
te_name varchar(20),
te_dept varchar(20)
);

CREATE OR REPLACE TRIGGER DeleteCustomer
BEFORE DELETE ON nm_employees
FOR EACH ROW
BEGIN
INSERT INTO terminated_employees (te_name,te_dept)
VALUES(:Old.name, :Old.dept);
END DeleteCustomer;