这样的话，我认为存储过程，触发器，外键是可选的，而不是强迫的，因此我可以自由的选择不去用它们。

As far as I am concerned the use of stored procedures, database triggers and foreign key restraints is OPTIONAL, not MANDATORY, therefore I am free to exercise my option not to use them.

youdao

联合表：(可选)将子类映射到与父类映射到的表具有外键关系的表。

Joined table: (Optional) the child class is mapped to a table that has a foreign key relationship to the table to which the parent is mapped.

youdao

非标识可选的外键关系。

Non-identifying optional foreign key relationship.

youdao