How to create an index based on 2 columns using the UNIQUE keyword in MySQL?

Question

I know how to make it like this:

ALTER TABLE birdwatchers.humans
ADD INDEX human_names (name_last, name_first);

But how to do the same thing using the UNIQUE keyword ( my book asks me for that )?

Answer 1

您可以使用添加唯一：

Alter table birdwatchers.humans add unique human_names(name_last, name_first);