er diagram, Database Management System

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Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level

What are referential integrity constraints? A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another rel

Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566

The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.

Question 1 What are the advantages of DBMS approach in managing data? Question 2 What are the services provided by a database system Question 3 List and briefly describe

For the relations R and S given below: R                      S A B C 1 4 7 2 5 8 3 6 9

What does data dictionary is a special file contains ? The data dictionary is a special file contain The name of all fields in all files.The width of all fields in all files an

Hot Backup: Some sites cannot terminate the database while creating a backup copy of the files. The cold backup is not a reliable option. So different kinds of backing up database

What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files

Discuss deferred update technique of recovery.  What are the advantages?  Ans:  The deferred update methods do not physically update the database on disk till after a transact