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Define the terms i) Key attribute ii) Value set
Key attribute: An entity type usually has an attribute whose values are exact from each individual entity in the collection. Such an attribute is known as a key attribute.
Value set: Each easy attribute of an entity type is associated with a value set that states the set of values that might be assigned to that attribute for every individual entity.
Before defines the second type of integrity constraint, viz., Entity Integrity, we should be well-known with the concept of NULL. Mostly, NULL is intended as a basis for dealing
What is a database? At any given time, they're storing a tremendous amount of information - inventory, in the case of Amazon, messages and interrelationships in the case of Tw
Describe domain constraints. Domain constraints contain entity integrity and referential integrity. The domain is a set of values that might be assigned to an attribute. The en
Explain the two types of participation constraint. 1. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
sy bcs project of hospital managment system
Oracle Fusion Middleware: Key Skills: Consulting,Architect, Oracle Fusion Middleware,ECM, UCM, Stellent,Identity Management, SOA Suites, BPEL, ESB,OAM,OIM,J2ee, Java, Livelink
What is RDBMS terminology for a row? A tuple is a RDBMS terminology for a row
What is a virtual table that draws its data from the result of an SQL SELECT statement? View is a virtual table that draws its data from the result of an SQL SELECT statement.
The Internal or Physical Level The collection of files permanently stored on secondary storage devices is called as the physical database. The internal or physical level is t
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
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