文件名称:级联删除-Oracle数据库Sql语句详解大全 PPT
文件大小:3.47MB
文件格式:PPT
更新时间:2024-05-15 15:58:02
详解大全
级联删除 CREATE TABLE child( id number primary key, p_id number references parent(id) on delete cascade ); CREATE TABLE child( id number primary key, p_id number references parent(id) on delete set null );