關於「mysql primary key用途」標籤，搜尋引擎有相關的訊息討論：

大家都是怎麼定義自己資料庫裡面的primary key? - iT 邦幫忙::一起 ...2013年12月18日 · 從理論方面，在資料庫的教材中題到，primary key 是該table 中具有唯一性與識別性的 ... 此特性，也可以是兩個以上的資料合成具有此特性的key 值，即可做為primary key。

... http://ithelp.ithome.com.tw/question/10133871 ... 如何整齊的排列 · 只談MySQL (如何透過phpmyadmin上mysql的function和procedure) ...缺少字詞： gl= | 必須包含以下字詞：gl=MySQL 8.0 Reference Manual :: 3.6.9 Using AUTO_INCREMENTCREATE TABLE animals ( id MEDIUMINT NOT NULL AUTO_INCREMENT, name CHAR(30) NOT NULL, PRIMARY KEY (id) ); INSERT INTO animals (name)  ...缺少字詞： 用途? gl= twMySQL 8.0 Reference Manual :: 13.1.20 CREATE TABLE StatementIf you do not have a PRIMARY KEY and an application asks for the PRIMARY KEY in your tables, MySQL returns the first UNIQUE index that has no NULL columns ...缺少字詞： 用途? gl= twMySQL 8.0 Reference Manual :: 13.1.20.4 CREATE ... - MySQLmysql> CREATE TABLE test (a INT NOT NULL AUTO_INCREMENT, -> PRIMARY KEY (a), KEY(b)) -> ENGINE=InnoDB SELECT b,c FROM test2;. This creates an ...缺少字詞： 用途? gl= twMySQL 8.0 Reference Manual :: 13.1.15 CREATE INDEX StatementSPATIAL and FULLTEXT indexes cannot have functional key parts. If a table contains no primary key, InnoDB automatically promotes the first UNIQUE NOT NULL ...缺少字詞： 用途? gl= twMySQL 8.0 Reference Manual :: 8.3.2 Primary Key OptimizationThe primary key for a table represents the column or set of columns that you use in your most vital queries. It has an associated index, for fast query performance.缺少字詞： 用途? gl= twON DUPLICATE KEY UPDATE Statement - MySQL :: Developer ZoneIf you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY , an ...缺少字詞： 用途? gl= tw關係鍵- 維基百科，自由的百科全書 - Wikipedia主鍵，又稱主碼（英語：primary key或unique key）。

... 代理鍵，PostgreSQL用serial，Oracle用SEQUENCE，在MySQL用標記有AUTO_INCREMENT的欄位。

圖片全部顯示Difference between Primary Key and Foreign Key - Dot Net Tricks2012年9月26日 · In SQL Server, there are two keys - primary key and foreign key which seems identical, but actually, both are different in features and behaviors.