释义 |
integrity rule #1 (object integrity) 第1号完整性规则(对象完整性) A rule which permits every data store entry in the system to have a unique identifier composed of the data store name and the primary key. No part of the primary key is permitted to have a null value. Integrity Rule #1 guarantees the every data element in the system specification has a unique address, namely, 〈DATASTORENAME, primary key value, ATTRIBUTENAME〉. 一种规则,允许在系统中的每个数据存储条目具有由数据存储名和主键组成的唯一标识 符。主键的各部分不允许有空值。本规则保证系统的规格说明中每个数据元素有唯一的地 址,也就是〈数据存储名,主键值,属性名〉。 |