MySQL Workbench：如何为某些属性设置约束

Question

In my database, certain attributes must only be set to certain values. For example, an attribute "status" can only be set to full-time, part-time, or temporary. How and where do I enforce this in MySQL Workbench? (as you can probably tell, I'm very new to MySQL)

Answer 1

You can do this in several ways. The least desirable way would be to set up a trigger. Another way is to define them as enumerated types. I'm not really a fan of enumerated types, because they are not easily shared among different tables.

You can also do this with a reference table and a foreign key constraint:

create table ReferenceStatus (
    status varchar(255) primary key
);

alter table t add constraint fk_t_status foreign key (status) references ReferenceStatus(status);