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Guidelines For Developing An ER Diagram

20 十月, 2015 - 09:56

NOTE: These are general guidelines which will assist in developing a strong basis for the actual database design (the logical model)

  • Document all entities discovered during the information gathering stage.
  • Document all attributes that belong to each entity. Select candidate and primary keys. Ensure that all non-key attributes for each entity are full-functionally dependent on the primary key.
  • Develop an initial E-R diagram and review with appropriate personnel. (Remember that this is an iterative process).
  • Create new entities (tables) for multi-valued attributes and repeating groups. Incorporate these new entities (tables) in the E-R diagram. Review with appropriate personnel.
  • Verify E-R modeling by normalizing tables.