ER Diagram, Database Management System

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Define entity integrity and referential integrity, Define entity integrity ...

Define entity integrity and referential integrity.  How does SQL allow specification of  these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut

Set difference, Set Difference If R1 and R2 are two union compatible re...

Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.

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Explain data abstraction? Data abstraction Data abstraction is a methodology in which enables us to isolate how a compound data object is utilized from the details of how it is

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What function divides one numeric expression by another and returns the remainder? MOD function divides one numeric expression by another and returns the remainder.

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What is data independence? Data Independence: Techniques which permit data to be changed without affecting the applications in which procedure it. There are two types of data

Define rule that value of foreign key appear in other table, Determine the ...

Determine the rule that a value of a foreign key should appear as a value of some particular table is called a  Ans: Referential constraint.    The rule that a value of a fo

Project, Preliminary entities and attributes of human resourse management d...

Preliminary entities and attributes of human resourse management database management system

Correlated and uncorrelated queries, need to get answer for questions 3&4 o...

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Write short notes on schema diagram, Write short notes on Schema diagram.  ...

Write short notes on Schema diagram.  A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema  diagram. Every relation appea

With the help of a diagram defines typical element modules, With the help o...

With the help of a diagram defines the typical element modules of a DBMS? The functional elements of a database system can be widely divided into: 1) Storage manager and 2) q

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