WebFeb 18, 2016 · There is no problem having a table that consists of foreign keys only. In your particular example it would be OK to remove the OrderID. Relational theory states that each table should have a candidate key so, ideally, the business rule you mention would be in place to make the foreign key only table a "good" table. WebAn attribute (or attributes) that uniquely identifies each row in a relation is called a Primary Key An attribute in a relation of a database that serves as the primary key of another relation in the same database is called a Foreign Key A primary key that consists of more than one attribute is called a Composite PK
Guide to table relationships - Microsoft Support
Webprimary key An attribute in a relation of a database that serves as the primary key of another relation in the same database is called a: A) link attribute. B) link key. C) foreign key. D) foreign attribute. foreign key A primary key whose value is unique across all relations is called a (n): A) global primary key. B) inter-table primary key. Weba. Entities 'A' and 'B' may sometimes be combined into single table with no relationship table needed. b. Relationship should be represented by placing both primary keys as foreign keys in other table. c. Relationship can be represented by placing primary key of 'A' as foreign key in table for 'B'. d. danish crown annual report 2022
Number of Possible Super Keys in DBMS - GeeksforGeeks
WebThe foreign key is the “customer_id” column, which refers to the primary key of the customers table. By using a foreign key, we can establish a relationship between the customers and orders tables, ensuring that each order is linked to a customer and that each customer can have multiple orders. Conclusion: primary key vs foreign key WebApr 11, 2024 · The current relationship between the United States and China, for example, can be thought of as a game. But so can less contentious relationships such as those that exist among some members of the European community. The participants in a game are called “players.” The players are assumed to be “rational.” WebMar 21, 2024 · A relation that is in First Normal Form and every non-primary-key attribute is fully functionally dependent on the primary key, then the relation is in Second Normal Form (2NF). Note – If the proper subset of candidate key determines non-prime attribute, it is called partial dependency. birthday cake palmerston north