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Consider the two relations given below Given that A is the primary key of R, D is the primary key of S and there is a referential integrity among S.A and R.A, discuss all
Explain how you can define an object model of a system. A list of terms that shall be used by end users to describe state and behaviour of objects in system. Different use
What is Trigger? Trigger: A database trigger is procedural code which is automatically executed in response to specific events on a particular table in a database. Triggers can
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
What are domain constraints? A domain is a set of values that might be assigned to an attribute .all values that appear in a column of a relation must be taken from the similar
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
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