Author Question: In crow's foot style E-R diagrams, a hash mark across the relationship line near an entity ... (Read 90 times)

sjones · **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?

LegendaryAnswers · **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.