分類標籤：primary 所有文章
primary key unique key差異
發布時間: 2021-10-03primary key与unique的区别_大头爸爸的博客2013年1月8日 · oracle的constraint中有两种约束，都是对列的唯一性限制――...
[SQL 基本觀念] primary Key / Index / Unique 差別 - Nic Lin's Blog
發布時間: 2021-10-03PRIMARY Key(PK) (主鍵)、Index (索引鍵)、Unique (不重複鍵)，index建立會占用儲存空間，資料增刪修時會異動、index...
difference between primary key and unique key - Stack Overflow
發布時間: 2021-10-03Primary Key (PK): It's also a column or group of columns that can identify a ...
Oracle CREATE primary key
發布時間: 2021-10-03Oracle / PLSQL: Primary Keys - TechOnTheNetThis Oracle tutorial explains how ...
When should I use primary key or index? - Stack Overflow
發布時間: 2021-10-03Basically, a primary key is (at the implementation level) a special kind of i...