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Author Question: For the M-O (parent mandatory, child optional) case, what action(s) should be taken to ensure ... (Read 62 times)

JGIBBSON

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  • Posts: 538
on: Jul 7, 2018
For the M-O (parent mandatory, child optional) case, what action(s) should be taken to ensure minimum cardinality is maintained?
 
  A) Define referential integrity constraint from child to parent
  B) Make foreign key NOT NULL
  C) Will require trigger or other application code
  D) Both A and B are correct

Question 2

The data model produced by reverse engineering is a(n) ________.
 
  A) conceptual schema
  B) internal schema
  C) dependency graph
  D) table-relationship diagram


Jossy

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Reply #1 on: Jul 7, 2018
Answer to Question 1

D

Answer to Question 2

D


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