MySQL Database
MySQL Unique
Prevent duplicate values in a column or column combination.
CREATE TABLE users (
id INT PRIMARY KEY,
email VARCHAR(255) UNIQUE
);A UNIQUE constraint rejects duplicate non-null values.
MySQL Database
Prevent duplicate values in a column or column combination.
CREATE TABLE users (
id INT PRIMARY KEY,
email VARCHAR(255) UNIQUE
);A UNIQUE constraint rejects duplicate non-null values.