First Normal Form (1NF) is defined as a table that has a primary key, where no single column contains multiple values, and the non-primary key columns are dependent on the primary key. AI generated definition based on:Data Mapping for Data Warehouse Design,2016 ...
第一范式(1NF)主要关注数据的结构,特别是表中的列。为达到1NF,数据库中每一个列必须只保存一个单一的值,而不能是集合或重复项。这一要求意味着,如果有一个列包含多个值,例如一名学生的多科成绩,则这个设计并不符合第一范式的标准。为了将此类数据转换为符合1NF的形式,我们需要拆分这些数据,将表中的条目进行适当...
First normal form (1NF) sets the fundamental rules for database normalization and relates to a single table within a relational database system. Normalization follows three basic steps, each building on the last. The first of these is the first normal form. The first normal form states that: ...
First normal form (1NF) 相关知识点: 试题来源: 解析 第一范式(1NF)要求数据库表的每一列都是原子性的,即不可再分,且每一行都是唯一的。 第一范式(1NF)是数据库规范化的基础规则。其核心要求是:1. **原子性**:表中的每一列必须包含不可再分的单一值,不能有集合、数组或嵌套结构。例如,“电话”字段...
英语缩写词 "1NF"，通常代表 "First Normal Form"，中文直译为“第一范式”。这个术语在数据库理论中至关重要，它用于描述数据模型的组织原则，确保数据的一致性和准确性。1NF是数据模型规范化的第一步，它要求数据表中的每个列应包含原子值，即不能再进一步分解的最小单位。1NF在学术界特别是数学领域...
7.3 First Normal Form (1NF) (11:15) 是在优酷播出的教育高清视频,于2015-10-22 14:14:12上线。视频内容简介:ShareCourse-CS13001 資料庫系統 Database Systems
Now that we understand the steps to transform a table and achieve 1NF, let’s have a look at two practical first normal form examples. Example 1: Customer orders table Imagine aCustomer Orderstable that looks like this: CustomerIDNameProduct1Product2OrderDate ...
10- 第一范式 | 1NF- First Normal Form 2387 播放 硬核科技 最全硬核科技干货>> 收藏 下载 分享 手机看 选集(155) 自动播放 [1] (中字)【第一章】1- 介绍 | ... 8.5万播放 00:18 [2] (中字)2- 什么是SQL | W... 6.0万播放 03:24 ...
The first level of guidelines for designing table and data structures in a relational database. The first normal form guideline recommends creating a unique key for every row in a database table, elim
1NF First Normal Form Further, various technical terms are used throughout this description. A definition of such terms can be found inNewton's Telecom Dictionaryby H. Newton, 22ndEdition (2006). These definitions are intended to provide a clearer understanding of the ideas disclosed herein but ...