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A field-groups statement or an insert statement reverses storage space and transfers values.
False.
diagrams and meaning
What are the disadvantages of relational approach? Disadvantages of relational approach: • Substantial hardware and system software overhead • May not fit all business models •
Define the concept of Object Diagram An object diagram shows a set of the objects and their relationships with each other at a point of time. In a static view, object diagram
In which format database schema is written ? Data base schema is written in the DDL format.
Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi
Synonyms It allows short names or alternative names for objects. Example : CREATE SYNONYM D30 FOR EMPD30; Now if we give command:
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
These permit the user to unload a database or parts of a database and reload the data on the similar machine, or on another machine in a dissimilar location. This can be useful in
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
A Distributed Transaction Let us demonstrate the concept of a distributed transaction by considering a banking system having of three branches located in 3 different cities. Ev
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