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Differentiate between a subquery and a join
If we need to acquire information from one or more tables after that either subquery or join can be used. If the columns which are to appear in the result table are from different tables after that a join must be employed.
The Form input elements are: Reporter name text type input Password
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
Determine the steps of path in association network You can analyse use of paths in association network in the following steps: Examine every operation and see what asso
Super keys of a relation can have extra attributes. Candidate keys are minimal super key, i.e. such a key have no extraneous attribute. An attribute is known as extraneous if even
Suppose that in an organisation, an employee may do different roles in dissimilar projects. Say, RAM is doing coding in one project and doing designing in another. Suppose that the
Define upgrade and downgrade? It gives a mechanism for conversion from shared lock to exclusive lock is called as upgrade. It gives a mechanism for conversion from exclusive
Question: (a) List four disadvantages of the File Processing System as compared to the Database Systems. (b) The integrity of a database is enforced by integrity rules. One
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
Distributed Database Management System
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