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A database is a set of data. But, is the data kept in a database trustworthy? To answer that query we must first answer the question. What is integrity?
Integrity simply means to keep the consistency of data. Therefore, integrity constraints in a database make sure that changes made to the database by authorised users do not compromise data consistency. Therefore, integrity constraints do not permit damage to the database.
There are primarily two integrity constraints: the referential integrity constraint and the entity integrity constraint. In order to describe these two, let us first describe the term Key with respect to a Database Management System.
Consider the subsequent relation schemes: Project (Project#, Project_name, chief_architect) Employee (Emp#, Empname) Assigned_To (Project#, Emp#) Give expression i
Parallelism of transaction execution: A transaction can be divided into various sub-queries that can operate on fragments in parallel. This enhances the degree of concurrency in t
Attribute Preservation This is a easy and obvious necessity that includes preserving all the attributes that were there in the relation that is being decomposed.
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
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explain external view
Deletion Anomalies: Loss of important Information: In some cases, useful information may be lost when a tuple is deleted. For instance, if we delete the tuple corresponding to stu
A table joined with itself is called ? A table joined with itself is known as self join table. Normal 0 false false false EN-IN X-NONE X-NONE
What is B-Tree? A B-tree eliminates the redundant storage of search-key values .It permits search key values to appear only once.
What is DBMS and what are functions of DBMS? DBMS consist of collection of integrated data and set of program to admission those data. The functions performed by a typical
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