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Attributes supply informational detail to the entity. An entity can have one or several attributes. Each instance of an entity must contain values for all the attributes to define it. For possible values an attribute can take, see the topic, Domains, at the end of this step.
Each attribute represents one characteristic of the entity.
Beginning with the Customer entity, you would consider the following its potential "attributes":
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CUSTOMER |
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Customer Code |
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Customer Name |
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Customer Address |
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Customer Credit Limit |
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Customer Account Balance |
For the Product entity, the attributes would be:
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PRODUCT |
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Product code |
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Product Name |
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Product Type |
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Product Description |
After identifying all the attributes for the primary entities of your Order Entry application, you have a list that looks like this:
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Entity |
Attributes |
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Customer |
Customer Code Customer Name Customer Address Customer Credit Limit Customer Account Balance |
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Product |
Product Code Product Name Product Type Product Description |
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Order |
Order Code Order Quantity Order Line Vendor ID Customer Code Product Code |
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Vendor |
Vendor ID Vendor Name Vendor Address |
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Foreign Vendor |
Foreign Vendor ID Foreign Vendor Name Foreign Vendor Address Foreign Vendor Country Foreign Vendor Duty Percentage |
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Purchase Order |
Purchase Order Code Purchase Order Quantity Purchase Order Line |
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