摘要: /*用触发器来实现级联更新级联删除*/ --创建学生表,课程表,学生课程表 --http://www.yaosansi.com/post/692.html 范本: 触发器方式: create trigger trg_A on A for update,delete as begin if exists(select 1 from inserted) update B set Name=(select Name from inserted) where Name=(select Name from deleted) else delete B where Name=(select Name from deleted) end go 下面是一个实例: CREATE TABLE [dbo].[学生表]( [studentid] [nvarchar](50) primary key NOT NULL, [name] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL, ) CREATE TABLE [d 阅读全文
posted @ 2010-05-21 21:25 叮当小马 阅读(13500) 评论(0) 推荐(1)
摘要: 参考网站: http://www.phpchina.com/manual/PostgreSQL/ddl-constraints.html /* 创建级联更新,级联删除操作 author: dingdang time :20100520 **/ --创建表 CREATE TABLE products ( product_no integer PRIMARY KEY, name text, price numeric ); CREATE TABLE orders ( order_id integer PRIMARY KEY, shipping_address text, -- ... ); /* CREATE TABLE order_items ( 阅读全文
posted @ 2010-05-21 21:19 叮当小马 阅读(2592) 评论(0) 推荐(1)