week 3

Concepts:

• hierarchical database model - data organised and accessed in hierarchy structure

• network model - data organised and accessed through nodes and links

• entity relationship model - data organised and accessed through use of relationships

Tools and their application:

• entity relationship diagram (ERD):

o used to design relational databases

• data flow diagram (DFD):

o level zero and level one

o visual representation of information flow within a system

Last Updated
2023-03-29 10:55:40