FAQs Categories
Client Server Commands
Database Structure
Table Types or Storage Engines
SQL Statements
Table Joins
Funtions and Operators
Tricky Select Queries
Speed Up Queries
Data Back Up
General Questions
1PLs Company - #1Payday.Loans Agency - Loans online and near me $100-$2500 (Same Day)
Powered by MySQL
Home / Indexes / Primary Key Indexes

The PRIMARY KEY INDEX is the most common type of index found in relational databases. In MySQL PRIMARY KEY is a field in a table that uniquely identifies each record in that table. In other words, all values in the indexed column(s) must occur once. A PRIMARY KEY must be unique and cannot contain NULL values. MySQL allows to create only one PRIMARY KEY in a table. It must be named "PRIMARY". AUTO_INCREMENT columns mostly use this type. The primary keys are almost always added when creating the table. However, these can also be created using some other sql statements.

Primary Key Indexes Related FAQs

How-to-create-primary-key-index-in-MySQL How to create primary key index in MySQL?

How-to-create-multi-column-primary-key-index-in-MySQL How to create multi column primary key index in MySQL?

About FAQs: Recently Added FAQs

About MySQL FAQs: Site Map | Bookmark Us | Recommend this Site to Your Friend | Contact Us

Useful Links: | | | |

© 2023
All rights reserved.