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Below is a sceanrio.. i need some help to do the following... i have done bits but i think i dont understand and need some guideance.. can anyone help me to find the..

1) entities
2) attributes
3) realtionships

withing the scenario below?

SonicLive is a UK company that is specialised in hiring out audio equipment to recording artists to be used for the recording, mixing and mastering of music projects such as music tracks and albums. The company is based on 12 recording studios located all over the UK, including 4 in London. SonicLife offers a really wide range of studio equipment to their customers such as analogue and digital recorders, mixing desks, audio interfaces, microphones, studio monitors, digital converters, controllers and other miscellaneous studio accessories.

The members of staff, who work in the SonicLive studios, include studio managers, drivers and sound engineers but some members of staff can be allocated to more than one studio. Every studio is assigned a studio manager. The role of the studio manager is to ensure the smooth day-to-day running of the studio that he/she is responsible for. The job of the drivers is to guarantee the safe transportation of equipment and for this purpose each driver is given a van and these vans are under the responsibility of the drivers they are given to and not shared among drivers. A record of which piece of equipment is transported by which driver needs to be kept. It is to be observed that vans can be out of service for certain periods of time, sometimes for quite a while, and are thus not used by any drivers during these times. The role of the sound engineers is to ensure that customers are provided with the right type of equipment for the music work that they want to do and that they can use it appropriately to get the best value out of it. Each engineer oversees a certain number of customers so that to ensure that all the customers have a first point-of-call in case they have any problems and thus to make sure that they receive the best possible customer service at all times. In addition, each engineer is responsible for a certain number of pieces of equipment which they need to closely look after in order to make sure that they are in pristine condition. To this effect, all pieces of equipment must be maintained regularly. At regular intervals or on specific dates, all pieces of equipments need to be serviced by the sound engineers who know how to fix them or by a whole group of engineers in the case of particularly complex equipment such as, for instance, large mixing desks. Similarly, if a piece of equipment is faulty, it needs to be repaired urgently so that it can be made available to the customers as rapidly as possible. It is also important to note that a piece of equipment is registered under a specific studio’s name so that a record is kept of which studio is ultimately responsible for it.
A distinction is made between two different types of equipment. There is equipment that is fixed, like large mixing desks, digital recorders or audio interfaces, in the way that this equipment cannot leave the studio because of the size and therefore can be used only in the studio under the guidance of a sound engineer. Other pieces of equipment like microphones, converters and other accessories are portable in the sense that they can be taken away by customers to be used anywhere. Because of the highly technical nature of the equipment offered by SonicLive, a customer needs to first place a request for any piece of equipment he/she is willing to hire. This request needs to specify the start date and the end date of the period of utilisation of a specific piece of equipment, the level of expertise the customer who is going to use it has and a description of the project for which this piece of equipment is going to be used. Once it has been submitted, a SonicLive sound engineer examines the request, finds out about the availability of the required piece of equipment for the required period of utilisation and decides whether to go ahead with hiring out this equipment or not. If the piece of equipment is portable, a Portable Equipment Hiring Agreement is drawn to record when the equipment is to be hired out to the customer, when it is due to be returned, the initial cost of the hiring, whether an additional insurance needs to be subscribed to and the total cost of the hiring including any additional insurance. If the piece of equipment is fixed, i.e. not portable, a Fixed Equipment Hiring Contract is produced to record which piece of equipment is to be used by which customer under the guidance of which engineer, as well as the start and end dates of this utilisation and the cost involved.

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Last Post by roshan605
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Without seeing what you already have, it's hard to help.

General guidance, though?

Entity = a Noun...something in the scenario you are interested in keeping track of. Example: Studio...Customer...StaffMember
Attribute = an Adjective...something that describes your Entity. Example: Equipment Portability Type.
Relationship = if your Entity affects some other Entity, they have a Relationship. Example: Engineer OVERSEES Customers

Hope this helps. Good luck!

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i need a small clarification , how do i represent "...A distinction is made between two different types of equipment. There is equipment that is fixed, like large mixing desks, digital recorders or audio interfaces, ....."

Shall i make two entities where the super class is Equipment -->Fixed and Portable ???

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Careful of mixing and matching your terminology here. We're talking entities, not classes. Therefore, if you have an entity "equipment" it could be sub-typed into Fixed and Portable.

Now (nitpicking aside) as a general rule, you only sub-type an entity if each of the subtypes have attributes or relationships to other entities that none of the other subtypes would have. So, in the above example, it appears that a Fixed equipment type must have a responsible engineer, but a Portable equipment type doesn't have one. Voila! There's your excuse...sorry, "reason"...to subtype.

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Yeah Thanx dude ., So there should IS-A type relationship ? isn't it ? And one more question how do i keep information of the driver and van?? it is said that, van can be out of order and sometimes drivers may not use vans at all .. so how can i keep those information ?

One more Clarification, Normally Er diagram direclty maps to tables, is it ?? if so, It would be ideal for have EquipmentCategory table and EquipmentItem table to store the physical records , I am bit confused over here .. Could you assist ??

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Yes, but you're hijacking someone else's thread. If you have a question, you should start your own thread.

This topic has been dead for over six months. Start a new discussion instead.
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