Question
This segment of an ERD displays a specialization hierarchy with subtype/supertype relationships. Choose all business rules that are represented by this diagram. This problem is
This segment of an ERD displays a specialization hierarchy with subtype/supertype relationships. Choose all business rules that are represented by this diagram.
This problem is scored right minus wrong answers, so it is not a good idea to guess.
I have given you a hardcopy of this ERD also in case you might find that easier to read.
Question 37 options:
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a) | TRAINING is a subtype of MECHTRN. |
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b) | MECHTRN is a bridge table that was used to remove the many-to-many relationship between MECHANICS and TRAINING. |
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c) | All mechanics are specialized in avionics (AV) maintenance. |
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d) | Some mechanics can specialize in engine (EN) maintenance. |
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e) | Mechanics can only specialize in one area of maintenance. |
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f) | All mechanics are employees. |
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g) | DATE_HIRED is an attribute of MECHANICS. |
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h) | Some mechanics specialize in both EN and AF. |
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i) | MECHTRN has a strong relationship with TRAINING. |
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j) | All mechanics have to have at least one area of specialization. |
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k) | MECH_TYPE is the subtype discriminator for the MECHANICS to EN/AF/AV subtype relationship. |
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l) | There are 4 subtypes of MECHANICS. |
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m) | All employees are mechanics. |
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n) | Some mechanics can specialize in airframe (AF) maintenance. |
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o) | MECHANICS are not required to have MECHTRN (mechanical training). |
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p) | Some employees may just be regular employees rather than having to be mechanics. |
Question 38 (2 points)
Referring to the Employee database above, is the JOBHIST table a weak entity or a strong entity?
Question 38 options:
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a) | weak entity |
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b) | strong entity |
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