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Author Question: In crow's foot style E-R diagrams, a hash mark across the relationship line near an entity ... (Read 47 times)

sjones

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on: Jul 7, 2018
In crow's foot style E-R diagrams, a hash mark across the relationship line near an entity indicates:
 
  A) a minimum cardinality of zero.
  B) a minimum cardinality of one.
  C) a maximum cardinality of one.
  D) a maximum cardinality of many.
  E) Both B and C

Question 2

What requirements must a two-dimensional table satisfy in order to be a relation?
 
  What will be an ideal response?


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LegendaryAnswers

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

E

Answer to Question 2

For a table to be considered a relation, it must meet several requirements. First, every cell must contain a single value. Second, there can be no duplicate rows. Third, each column must have a unique name. Fourth, the order of the columns must have no significance. Fifth, all values for a given column must be of the same type. Finally, the order of the rows must have no significance.


sjones

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Reply 2 on: Jul 7, 2018
Excellent

kjohnson

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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