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Explain Derived and Non-Derived Attribute?
In few cases, two or more attribute values are related, for instance, Age and BirthDate attributes of a person. For specific person entity, the value of Age can be determined from the current date and the value of that person's BirthDate. Therefore, the attribute Age is known as derived attribute and the attribute BirthDate is known as non-derived or stored attribute.
Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a
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Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp
Which language has presently become the defacto standard for interfacing application programs along with relational database system? The language which has recently become the
What is the aim of logical schema ? The main motive of the logical schema is to ensure the portability of procedures and models on various physical schemas at runtime.
A step-wise distributed database design methodology Following is a step-wise methodology for distributed database design. (1) Examine the nature of distribution. Find out wh
The participation Constraints shows whether the existence of an entity depends on its being associated to another entity by the relationship type. There are two kinds of participat
What is the need of a log in a DBMS? Briefly describe the various types of records that are normally present in a log. Ans: The system log, which is generally writt
Differance between DDL and SDL? DDL and SDL - The data definition language (DDL) is used through DBA and database designers to describe internal schema, conceptual schema, and
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