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What is a view? How it is related to data independence?
A view might be thought of as a virtual table, that is, a table that does not really exist in its own right but is instead derived from one or more underlying base table. In other words, there is no kept file that direct represents the view instead a definition of view is kept in data dictionary.
Growth and restructuring of base tables is not reflected in views. Thus the view can insulate users from the effects of restructuring and growth in the database. As accounts for logical data independence.
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explain participation constraints with examples
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what is Mapping Constraints? with examples
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
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