使用自动增量主键作为外键

Question

I'm creating a database and I'm not sure about one thing. I have an autoincrement primary key which I want to use as a foreign key. Should the foreign key also be autoincrement?

Answer 1

The foreign key field must not be auto-increment. Auto-increment values imply that the field is not a foreign-key.

The purpose of auto-increment attributes is to generate a unique identity for new rows in the current table . The purpose of foreign keys is to uniquely identify rows in another table . They are very different things and you should read more about both and properly understand the difference.

Answer 2

自动增量允许在将新记录插入表中时生成唯一编号。