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Each relational table must have at least one candidate key. A candidate key is an attribute (or attribute combination) that uniquely identifies each row in that table, with one additional important property: as soon as you remove any attribute from this candidate key attribute combination, the property of unique identification is gone. In other words, a table cannot contain two rows with the same candidate key values at any time. For example, the attribute combination course code and start date is a candidate key for a table containing information about course offerings. If you remove the start date attribute, the remaining course code attribute is not a candidate key anymore; otherwise, you could offer courses only once. If you remove the course code attribute, the remaining start date attribute is not a candidate key anymore; otherwise, you would never be able to schedule two different courses to start on the same day. In case a table has multiple candidate keys, it is normal practice to select one of them to become the primary key. All components (attributes) of a primary key are mandatory; you must specify attribute values for all of them. Primary keys enforce a very important table constraint: entity integrity. Sometimes, the set of candidate keys doesn t offer a convenient primary key. In such cases, you may choose a surrogate key by adding a meaningless attribute with the sole purpose of being the primary key. asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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