Based on the above ER diagram, which of the following can be true? A cat can own

Question

Based on the above ER diagram, which of the following can be true? A cat can own no (zero) hats. A cat can own many hats. A hat can be owned by no (zero) cats. A hat can be owned by many cats. In general, which of the following statements are true? Select all that apply. There is at least one true option. A relationship involving a key constraint can be many-to-many. A 1-to-1, relationship must involve two key constraints, and vice versa. A 1 -to- {1, many} relationship must involve at least one key constraint A many-to-{ 1, many} relationship must involve at least one participation constraint. A many-to-many relationship must involve two participation constraints, and vice versa. A relationship involving a participation constraint can be 1-to-1.

Explanation / Answer

1) Based on the above ER diagram ,which of the following can be true?

a) A cat can own no(zero) hats

b) A cat can own many hats

c) A hat can be owned by no (zero) cats

d) A hat can be owned by many cats

Answer: B

2) In general , which of the following statements are true?

Select all that apply , there is at least one true option.

a) A relationship involving a key constraints can be many to many

b) A 1-to - 1 relationship must involve two key constraints and vice versa

c) A 1- to -{1,many} relationship must involve at least one key constraint

d) A many - to - {1,many} relationship must involve at least one participation constraint

e) A many - to - many relationship must involve two participation constriants and vice versa

f) A relationship involving a participation constraint can be 1 - to -1

Answer: C

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