Results 1 to 2 of 2
  1. #1
    Join Date
    Jan 2013
    Posts
    2

    ERD and Natural join

    Hi, With respect
    According to this diagram:
    http://www.dbforums.com/attachment.p...0&d=1357829350

    And the following information:
    - 200 records in the Employee entity
    - 5 records in Project entity

    In your opinion,
    What is the minimum and maximum number of records to Natural join these two entities? Minimum = 200 and Maximum = 1000 ? or Minimum = 0 and Maximum = 1000 ? and Why?

    Thank you very much

    Click image for larger version. 

Name:	ERD-DD.jpg 
Views:	7 
Size:	19.7 KB 
ID:	13950

  2. #2
    Join Date
    Jun 2003
    Location
    Ohio
    Posts
    12,592
    This smacks of being a homework question because:
    A) It is utterly generic.
    B) It is the type of nonsense question that only a professor would think up. "Minimum and maximum number of records to Natural join these two entities?"
    No records are required in either table in order to establish a relationship between the two.
    If it's not practically useful, then it's practically useless.

    blindman
    www.chess.com: "sqlblindman"
    www.LobsterShot.blogspot.com

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •