In a relational database designed for a healthcare clinic, there are two tables: 'Patients' and 'Appointments'. The 'Patients' table has a 'PatientID' field, which uniquely identifies each patient. How should this field be properly used in the 'Appointments' table to maintain a relationship between the two tables?
Copy all patient information into the 'Appointments' table for each appointment
Include 'PatientID' as a 'Foreign Key' in the 'Appointments' table
Generate a random unique identifier for each appointment separately from 'PatientID'
Create a new 'AppointmentID' field in the 'Patients' table
In a relational database, a 'Primary Key' in one table is used to uniquely identify each record in that table. To relate this table to another, the primary key is included in the second table where it is known as a 'Foreign Key'. Therefore, the 'PatientID' from the 'Patients' table should be included in the 'Appointments' table as a 'Foreign Key' to establish a relationship between patients and their appointments. This approach correctly maintains referential integrity by ensuring that every appointment record is associated with a valid patient record. The other options do not correctly establish this connection within the context of a relational database structure.
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