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11 Cards in this Set
- Front
- Back
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Composite primary key
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the primary key fields from two intersecting relations.
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Database
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a collection of information that you organize and access according to the logical structure of that information.
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Database management system (DBMS)
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helps you specify the logical organization for a database and access and use the information within the database.
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Entity class
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a concept-typically people, places, or things about which you wish to store information and that you can identify with a unique key (called the primary key).
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Entity-relationship (E-R) diagram
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a graphic method of representing entity classes and their relationships.
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Foreign key
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a primary key of one file (relation) that appears in another file (relation).
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Instance
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an occurrence of an entity class that can be uniquely described.
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Intersection relation
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a relation you create to eliminate a many-to-many relationship.
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Normalization
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a process of assuring that a relational database structure can be implemented as a series of two-dimensional relations.
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Primary key
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a field (or group of fields in some cases) that uniquely describes each record.
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Relational database
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uses a series of logically related two-dimensional tables or files to store information in the form of a database.
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