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Views
A view is like a window by which data from tables can be changed or viewed. The table on which a view is based is known as Base table. The view is stored as a SELECT statement in the data dictionary. When the user needs to retrieve data, using view. Then the following steps are defined.
1) View definition is finding from data dictionary table. For example, the view definitions in oracle are to be finding from table name USER-VIEWS.
2) Checks access privileges for the view base table.
3) Changes the view query into an equivalent operation on the underlying base table
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
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In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
how to prepare a data dictionary for online examination system for certified courses?
What is the difference between internal tables and extract datasets? The lines of an internal table always have the similar structure. By using extract datasets, you can ha
Need a sample of a clinic database relationships
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