Data Modeling › Data Model › Declaring More Files

Declaring More Files

You can define the RACE ENTRY, HORSE, and JOCKEY files using the Known by, Has, and Owned by relations as you did for the COURSE and RACE files.

In addition, since RACE ENTRY requires references to the HORSE and JOCKEY files, you will also use the Refers to relation. The Refers to relation specifies a relationship between two files. It causes the key entries of the referenced file (HORSE and JOCKEY) to become foreign keys of the referencing file (RACE ENTRY).

Note that a file may reference another file more than once, as shown later in this tutorial.

Type the RACE ENTRY, HORSE, and JOCKEY relations.

Press F10 to define the new objects.