Question

Compare and contrast among data flow diagram (DFD), entity relationship diagram (ERD), and record layout diagram (RLD). Cite concrete examples.

Answer 1

Basically DFD and ERD are generally called as the data models which can be used for a better communication between the members of group.

DFD :- generally data flow diagram is used for outling the patern and system of data but is generally doesnot tells ablout the time it takes for processing. it generally tells about the entering , transforming and storing data.

example is the food ordering system in restaurant.

ERD:-  It generally specifies the relationship between the various entities in an information system :locations, members and roles.it generally shows the overall framework.

example is the university database in which these are various entities for students.

RLD :- Generally record layout diagrams are used to mention the internal structure of records which are genrally specifying a file .

example is team working on a warehouse design

answered by: anonymous