如何为MySQL中2列的组合创建唯一的

Question

I have a persons table with firstname, lastname, password, email, phone, etc

I want to create a unique constraint where many people can have the same firstname or more than one person can have the same email address (in case household uses only one) but no two people can have the same firstname and email address at the same time

Is this possible?

Answer 1

执行此DDL语句。

ALTER TABLE myTable ADD CONSTRAINT tb_UQ UNIQUE(firstname, email)