Hello, I am a apprentice and I was assigned to actualize my aboriginal article accord diagram and I’m affectionate of lost. The assistant hints the paintings should be burst into a generalization bureaucracy back they accept so abounding attributes but I can alone breach them into two sub(entities) based on my compassionate of G.H.(using the “is a” rule)
Anyway I’m disturbing with that and award the anemic entity(professor additionally hinted that there is a anniversary entity)
I absorbed what I accept so far as ERD1.pdf (didn’t authorize accord type/participation constraints yet)
Am I alike on the appropriate track/have the appropriate idea?
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The alert is below:
The BestArt museum, which owns several millions artifacts, has asked you to do the conceptual architecture of a database for the afterward advice requirements.
The alone artifacts of the building in its database will be paintings. Anniversary painting is abnormally articular by an antiquity number. Abstracts about anniversary painting accommodate a name, year completed, year acquired by the museum, estimated value, and a “school” (e.g. Cubism). Anniversary painting was created by one painter, although the painters of some paintings are unknown. Due to curtailment of display rooms, the atomic admired paintings are kept for continued aeon of time in accumulator rooms, admitting the best admired ones are apparent in display rooms. A allowance is articular by a altered allowance cardinal and has a admeasurement (in aboveboard feet).
Some of the BestArt paintings may be on accommodation to affiliated museums, about for several months. BestArt may additionally accept acting control of paintings loaned to it by affiliated museums. They are apparent in display apartment alongside BestArt paintings, about for several months. Anniversary affiliated building has a altered name, a city, a state, and a babysitter (with whom BestArt negotiates loans). Paintings loaned to BestArt or by BestArt will additionally be in the database and will accept the aforementioned attributes as the paintings endemic by BestArt, additional a acknowledgment date
Customers of BestArt abide of associates and non-members. Associates may be VIP or approved members. VIP may be benefactors and/or docents. Benefactors accept a akin (e.g., silver, gold, …). There is an cessation date for approved members. A adviser may accept one or several specialties, such as cubism and impressionism. A adviser may beforehand to be present at assertive dates and times in a specific allowance to explain the allowance paintings to visitors. In account of a painting loaned to BestArt, there may be one or several gala-nights at altered dates, with invitations to some benefactors. BestArt additionally organizes art-nights. An art-night will absorb a altercation about one painter by one docent. A date and time is specified. Non-members who ambition to appear art-nights are appropriate to annals in advance. A building allowance may or may not be defined for an art-night.
The afterward abstracts is affected for all bodies in the database: a altered id, a name, sex, year of birth, year of afterlife (when applies), country of birth.
what I accede to be his hints2. As discussed in chic apropos the qualities of an ERD, abyss is added important than simplicity. For example, if the advice requirements call in some breadth altered categories of PAINTINGs, with altered relationships to added entities, maybe that tells you if your ERD should accept a distinct article or a Generalization Hierarchy.
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