Question

oracle中把父表中的值删掉,则子表中相关的值也删掉,并把删掉的值放入另一个表中

Answer 1

使用级联删除+触发器可以搞定你的需求。
父表A 子表B 备份表C
命令如下:
create table A
(
dept_ID number primary key,
dept_name varchar2(10)
);

create table B
(
no number primary key,
name varchar2(10),
dept_id number
);

ALTER TABLE WWJ.B ADD CONSTRAINT FK_B FOREIGN KEY (DEPT_ID) REFERENCES WWJ.A (DEPT_ID) ON DELETE CASCADE ENABLE VALIDATE;

CREATE OR REPLACE TRIGGER WWJ.TR_B_01
BEFORE DELETE
ON WWJ.B
REFERENCING NEW AS New OLD AS Old
FOR EACH ROW
BEGIN
INSERT INTO C VALUES(:old.no,:old.name,:old.dept_id);
END;

Answer 2

可以在父表上加触发器，before delete的
先根据条件备份子表数据，然后delete子表数据