Respuesta :
A referential integrity restriction is a requirement that the values in an unique identifier must match the values in the main key to which the unique identifier belongs.
Primary and foreign keys: what are they?
To guarantee that the data in a given column is unique, a key value is employed. A relational database table's foreign key refers to a column or set of columns that creates a connection between the data in two tables. That gives a record in a relational database table a special identification.
What characteristics does a foreign key have?
A primitive kind property (or group of primitive kind properties) on one entity type that includes the object key of some other entity type is known as an unique key property inside the Entity Database Schema (EDM). In a relational database, a foreign key column is equivalent to a foreign key property.
To know more about foreign keys visit :
https://brainly.com/question/15177769
#SPJ4
