Term
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Definition
| represents reality in an abstracted form that can be used in developing an IS ina wide variety of formats |
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Term
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Definition
| represents reality in the format requred by a particular database model |
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Term
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Definition
| created specifically for a particular database software package |
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Term
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Definition
| a primary key from a different table that has been postied into the table to create a link between the two tables |
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Term
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Definition
| table extensions or tuples |
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Term
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Definition
| attributes, table intentions or schema |
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Term
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Definition
| primary key in a table must not contain a null value |
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Term
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Definition
| a foreign key must either be null or already exist in another table |
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Term
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Definition
| reduce redundancy, addresses load |
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