DBMS Questions et reponses d'entretien
Test your skills through the online practice test: DBMS Quiz Online Practice Test
Differences associees
Question 36. What is Data Model?
A collection of conceptual tools for describing data, data relationships data semantics and constraints.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 37. What is Object Oriented model?
This model is based on collection of objects. An object contains values stored in instance variables with in the object. An object also contains bodies of code that operate on the object. These bodies of code are called methods. Objects that contain same types of values and the same methods are grouped together into classes.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 38. What is Weak Entity set?
An entity set may not have sufficient attributes to form a primary key, and its primary key compromises of its partial key and primary key of its parent entity, then it is said to be Weak Entity set.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 39. What is an Entity?
It is a 'thing' in the real world with an independent existence.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Question 40. What is an attribute?
It is a particular property, which describes the entity.
Est-ce utile ?
Ajouter un commentaire
Voir les commentaires
Les plus utiles selon les utilisateurs :
- What is database or database management systems (DBMS)?
- What is SQL?
- What's the difference between file and database? Can files qualify as a database?
- What are E-R diagrams?
- Whats difference between DBMS and RDBMS?