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GyanMul Prep · NEB +2 · Grade 12

Computer Science (Grade 12)

Everything on these tabs is Computer Science (Grade 12) only, within NEB +2 Grade 12.

Grade 12 subjects

GyanMul Prep · NEB +2 · Grade 12

Computer Science (Grade 12)

Everything on these tabs is Computer Science (Grade 12) only, within NEB +2 Grade 12.

Grade 12 subjects

Chapter 2 of 26 · Computer Science (Grade 12)

Data Models and the Entity-Relationship Model

8 topics
Board exam — Database Management System, 8 marks across 4 chapters
12 solved questions

How the shape of data is described before a table exists: the models in use, and the ER diagram that turns a description of a business into entities and links.

Practise this chapter Read solved questions

Topics

What the syllabus defines for this chapter

1Data model: definition and purpose
2Hierarchical, network and relational data models
3Entity, attribute and entity set
4Types of attribute: simple, composite, derived and multivalued
5Relationship and relationship set; degree of a relationship
6Cardinality: one-to-one, one-to-many and many-to-many
7Drawing an Entity-Relationship diagram and its symbols
8Converting an ER diagram into relations