database relational造句

In database relational modeling and implementation, a unique key is a set of zero or more attributes, the value ( s ) of which are guaranteed to be unique for each tuple ( row ) in a relation.
In order to call your database relational you'll need more than one table, and frankly, if you're going to be doing what I think you're going to be doing then you'll definitely need more than one table.
It's difficult to find database relational in a sentence. 用database relational造句挺难的