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14 Jun 19
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entity
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a single table
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The student entity would likely be composed of several pieces of information, for example: student identification number, name, and email address. These pieces of information are better known as attributes.
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primary key
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uniquely identifies a row of data found within a table
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could be the result of a combination of several components of the entity
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while a location could not be a primary key for a class, since there might be several classes held there throughout the day, the combined time and location would make a satisfactory primary key, since no two classes could be held at the same time in the same location.
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known as a concatenated primary key.
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table optimization is accomplished through the elimination of all instances of data redundancy and unforeseen scaleability issues.
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09 Mar 13
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18 Oct 12
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04 Sep 06
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