ERD Diagrams presentation, computer science homework help

  

Prepare a PPT presentation that addresses the following in ERD Diagrams:  need atleast 15-20 slides    1.  How do you decide on entities (tables)?    2.  Why do you select a specific field and its type?     3.  Why are field values coded or compressed?     4.  What means are available to control integrity of fields?     5.  How can possible missing field values be handled (nulls)?

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