Speech note

An ER diagram gives the conceptual view of a database by showing real-world entities and their relationships. In our Retail Store Management System, we use ERD to represent how different parts of the system are connected. An entity is a real-world object that can be uniquely identified. In our ER diagram, examples of entities are Product, Customer. Attributes are the properties of an entity that help to describe or identify it. A primary key is the most suitable candidate key that uniquely identifies each row in a table. You can explain Foreign Key simply like this in your discussion: “A foreign key is an attribute in one table that refers to the primary key of another table. It is used to create a relationship between two tables and maintain referential integrity in a relational database.” Example Table Branch Branch_ID (PK) Location B01 Lahore B02 Karachi Table Stock Stock_ID Branch_ID (FK) Product_ID S01 B01 P10 Here: Branch_ID in Stock → Foreign Key It references Branch_ID (Primary