Using ENUM in MySQL Columns

ENUMs are very powerful definitions and they help attain data validation when the values are pre-defined. With this you can avoid application-level validation or the same can be extracted from the database and used in applications to define the validation data.

In the DDL below, we are defining a column named transport_type with its values defined in ENUM. This will ensure that the values are always validated by the database before any insertion or updation.

CREATE TABLE TransportTypes (transport_type_id INT,transport_type ENUM('Bus','Train','Flight'));

The following is valid SQL:

-- -- -- -- -- -- -- -- -- -- -- --INSERT INTO TransportTypes VALUES (1,'Bus'), (2,'Train'), (3,'Flight');Below is an invalid SQL query. This results in error during the execution:
-- -- -- -- -- -- -- -- -- -- -- --UPDATE TransportTypes set transport_type ='Train2' where transport_type_id=2;
Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS

homes in the real estate industry

Exploring the Latest Tech Trends Impacting the Real Estate Industry

The real estate industry is changing thanks to the newest technological advancements. These new developments — from blockchain and AI to virtual reality and 3D printing — are poised to change how we buy and sell homes. Real estate brokers, buyers, sellers, wholesale real estate professionals, fix and flippers, and beyond may