Introduction To DBMS Part One

Contributed By: Hosnia Batool 

What is data?

facts and statistics collected together for reference or analysis.Data is also known as raw fact(not processed).

I.e : Name, gender etc.

Data is plural of datum (sing piece of information).

what is information?

Information is the result of processed data.Information is also facts provided or learned about something or someone.

What is database?

is a collection of related data and data is a collection of facts and figures that can be processed read more

Introduction To DBMS Part Two

Contributed By:: Ms. Hosnia Batool

Generalization Aggregation

The ER- Model has the power of expressing database entities in a conceptual hierarchical manner. As the hierarchy goes up, it generalizes the view of entities, and as we go deep in the hierarchy, it gives us the detail of every entity included.

Going up in this structure is called generalization, where entities are clubbed together to represent a more generalized view. For example, a particular student named Mira can be generalized along with all the students. The entity shall be a student, read more