Chapter 2 DATABASE DESIGN FOR SQL SERVER 2000
Chapter 2 DATABASE DESIGN FOR SQL SERVER 2000 65 remember that this simulation is missing a lot of information, so there are likely to be many more attributes than those listed. Naming Attributes For the case study of Lloyd s Hospital, attributes are defined as shown in Figure 2.2. To create and identify attributes is a developed skill; there is no set method for doing so you just need to practice. However, there are some good guidelines available that will help you in creating and choosing the best attributes for your data model. The first is how you name your entities. A good name makes an attribute look professional and helps in its readability. Here are some good guidelines that help in naming entities. Remember to always follow these to keep your design consistent. An entity or an attribute should be named in its singular form, thereby implying that it is only a single instance. An instance is a single occurrence of an entity. The use of underscores ( _ ) in naming attributes is not a good habit because special characters have particular meanings in some software packages, and the mixture of text and other characters is difficult to type. Try to distinguish a word from another by using mixed case, as in DeliveryService rather than Delivery_Service. Patien. Traine. Cours. Nam. Nam. Nam. Addres. Addres. Locatio. Gende. Gende. Cos. Dat. Registere. Dat. Registere. Availabl. Dat. o. Birt. Dat. o. Birt. SS. SS. Nam. o. Cours. Paymen. Du. Employe. Medicin. Machiner. Nam. Nam. Nam. Addres. Locatio. Locatio. Gende. Shel. Purpos. Dat. o. Birt. Ove. Counte. SS. Controlle. Contrac. Typ. FIGURE 2.2 Salar. Attributes implementation in an Entity Positio. Relationship diagram (ER diagram).
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