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Describe logical data independence ?
Logical Data Independence - It is the capacity to modify the conceptual schema without having to change external schemas or application programs. The conceptual schema might be changed to expand the database (through adding a record type or data item), to change constraints, or to decrease the database (by removing a record type or data item). Only the view definition and the mappings required are changed in a DBMS that supports logical data independence. Changes to constraints could be applied to the conceptual schema without moving the external schemas or application programs.
what is attribute is attribute inheritance in dbms?
What is the role of ORDER By Clause? ORDER BY clause: The ORDER BY clause permits you to sort the records in your result set. The ORDER BY clause can just be used in select s
explain ANSI SPARC architecture
A customer places orders for parts and belongs to a particular industry group. An individual order is taken by a particular sales representative on a specific date and the sales re
We require an advanced system for a Sports Centre, you are concerned only with representing the data discussed below about bookings and members. (The complete system may contain ot
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
Draw an EER diagram that captures the "is-a" hierarchy of students in another simple database. The database captures both the "basic" information (say, student ID and student name)
DISADVANTAGES OF RDBMS
A relationship set is a set of relationships of the similar type. For example, let consider the relationship among two entities sets course and student. Collection of all the in
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
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