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By: a guest on Aug 1st, 2012  |  syntax: None  |  size: 0.27 KB  |  hits: 7  |  expires: Never
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  1. Database design: multi-path integrity constraints
  2. Grades -----> Students
  3.    |             |
  4.    |             |
  5.    v             v
  6.  Topics -----> Levels
  7.        
  8. Grades -------> X -------> Students
  9.    |             |
  10.    |             |
  11.    v             v
  12.  Topics ----> Subjects
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