Word Count : 473

---

In a DBMS Lab, `patient_id` is an important field used to identify a particular patient in a database table. When `patient_id` is defined as a Foreign Key, it establishes a relationship between two tables. A foreign key is a column or a set of columns in one table that refers to the Primary Key of another table. It helps maintain referential integrity and ensures that relationships between records remain valid. For example, consider a hospital database containing two tables: `patient` and `appointment`. The `patient` table may contain `patient_id` as its primary key. The `appointment` table can contain `patient_id` as a foreign key to identify which patient has a particular appointment. A simple structure can be represented as: ```sql ___ ______ ________ ___ ________ ___ ______ _______ __________.
_____ ____ ____ ______ _____ _____.
______ ______ ______ __________ __________.
___ ___ ____ _______ __________ ____ _________ __________.
____ ______ _____ __________ __________ ____ _____.
________ ______ ___ __________ ________ ____ _____ ____.
_______ ___ ___ _____ ____ __________ ________.
__________ _____ _______ ____ ______ ____.
_____ ____ _______ _________ ______ _______.
______ ________ _____ ____ ____ _______ ______ ________ ____ __________ __________ ______.
____ ____ ___ __________ _______ _______ _____ ____ _____ __________.
_________ ___ _____ _____ _________ _______ ___ _______ ________ ________ ______.
______ ____ _________ ________ __________ _________ _______ _______ ________ ______ ________ ________.
___ _______ ______ ___ ___ __________ ______ ___ ________ _____ _____ ______.
___ ______ _______ __________ ____.
__________ ______ ___ ______ _________ ____ ______ ________ _____ ____.
____ _____ ______ _____ _________ ______ _______.
________ _________ _________ _________ _________ __________ ________ __________ __________ _____ ________ ________.
____ _______ _____ _______ __________ ______.
______ _____ __________ ______ _____ ________ _____.
____ ____ ___ __________ ___ ____ ________ __________ ____.
___ _______ ________ ______ _________ ______ ____ ______.
___ _________ ____ __________ ________ ________ ____.
______ ________ ____ _____ _____ _______ ______.
_______ _______ __________ _______ ____ __________.
___ _______ _________ __________ ____ _____ ________ _____ ______ _____ ___.
_____ _________ _________ _____ ________ ________ ____ _________ _________ ____ _______.
____ ___ _________ ____ ______ _________ _____ _________ _______ ___ _____ _______.
______ ________ _____ _______ __________ _______ _______ ________ ___ _____ _______ __________.
________ ___ ______ _____ ____ __________ _________ ________ _____.
____ ____ ____ ________ _______ ______.
_______ ____ ____ __________ _______ ____ _________ ____ _______ _____ _________ ___.
____ ________ ____ ____ _______.
__________ _________ ______ ___ ________ _________ __________ ___ _______.
___ ________ _______ _____ _________ __________ ____ ______ ______ _____ _______ ______.
_______ __________ __________ _________ __________ ________.
_________ __________ _______ _________ ______.
_____ _______ _________ ___ ________.
_______ _______ _________ __________ _________ _________ ________ ______ _____ ____.
_________ ________ _______ ___ _________ ________ ______ _________ ______ ___ _________.
____ ______ ___ _________ ____.
_______ __________ ____ ______ ___ ___ ________ _________ ___ _____.
________.
Get Full Answer on WhatsApp