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  Creation of an E-R Diagram

Creating an E-R Diagram

To create an ER diagram, the following steps should be followed:

  • Customers are asked to enlist all the primary data objects that the application or business process addresses. These things or data objects result in the generation of lists of all inputs and their corresponding output data object,
  • Every object is considered at a time and its relationship (if any) with other object is determined.
  • Relationship pair is constructed wherever connection exist,
  • For every object relationships pair, determine it s cardinality and modality,
  • Once the entities along with their relationships are completely determined define their attributes,
  • Then formalize and normalize the entity relationship diagrams and
  • Repeat all the above steps till data modelling is complete.

To perform the data modelling designer must take the following decision.

  • Whether a real world concept is more expressible by entity set or relation set ,
  • Whether to use an attribute or entity set as the representation of objects.
  • Whether to use ternary relationship or binary.
  • Whether to use strong or weak entity set.
  • Whether to use generalization or hierarchy relationship to contribute to modularity ,and
  • Whether using aggregation is appropriate.

Symbols used in ER Diagram

There are various   symbols and notations that are used to create an ER diagram. These symbols and their names are listed below in the table4.1.

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