Database/DBMS Interview Questions And Answers

Database/DBMS Interview Questions And Answers - Part V.

21) What Is DDL (Data Definition Language), VDL (View Definition Language) and SDL (Storage Definition Language)?

Answer: A database schema is specified by a set of definitions expressed by a special language called DDL. It is used by DBA and database designers to specify the conceptual schema of a database.

In many DBMSs, the DDL is also used to define internal and external schemas (views). Also in some DBMSs, separate storage definition language (SDL) and view definition language (VDL) are used to define internal and external schemas.

VDL (View Definition Language) specifies user views and their mappings to the conceptual schema.

SDL (Storage Definition Language) is to specify the internal schema. This language may specify the mapping between two schemas.

SDL is typically realized via DBMS commands provided to the DBA and database designers

22) What Is Data Storage - Definition Language?

Answer: The storage structures and access methods used by database system are specified by a set of definition in a special type of DDL called data storage-definition language.

23) What Is DML (Data Manipulation Language) and DML Compiler?

Answer: DML enables user to access or manipulate data from database as organized by appropriate data model.

Types of DML are:

Procedural DML or Low level: DML requires a user to specify what data are needed and how to get those data.
Non-Procedural DML or High level: DML requires a user to specify what data are needed without specifying how to get those data. Example: SQL.

DML Compiler translates DML statements in a query language into low-level instruction that the query evaluation engine can understand.

24) What Is DDL Interpreter?

Answer: It interprets DDL statements and records them in tables containing metadata.

25) What Is Data Model, E-R MODEL & Object Oriented Model?

Answer: A data model is a collection of conceptual tools for describing data, data relationships data semantics and constraints.

E-R model is based on real world that consists of basic objects called entities and of relationship among these objects. Entities are described in a database by a set of attributes.

ER Model has three main concepts:

Entities (and their entity types and entity sets).
Attributes (simple, composite, multi valued).
Relationships (and their relationship types and relationship sets).

Object Oriented 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.

ALSO CHECK THE BELOW FAQ's:

26) What Is An Entity, Entity Type & An Entity Set?
27) What Is An Attribute? Also Define What Is A Domain?
28) What Are The Different Types Of Attributes In DBMS?
29) Differentiate Between Simple, Composite & Multi-Valued Attributes In DBMS?
30) What Are Relation Schema & A Relation?

31) What Is Degree Of A Relation?
32) Discuss The Properties Of A Relation?
33) What Is Relationship, Relationship Type & Relationship Set?
34) What Is Degree Of Relationship Type?
35) What Is A Recursive Relationship Type?

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Tell Me Something About Yourself - Interview Answers.

Try to introduce some of your most important employment-oriented skills as well as your education and accomplishments to the interviewer. Answer to this question is very important because it positions you for the rest of the interview . That's why this statement is often called the "Positioning Statement". One should take the opportunity to show his/her communication skills by speaking clearly and concisely in an organized manner. Since there is no right or wrong answer for this question hence it is important to appear friendly. YOUR ANSWERS CAN BE: 1) I am a person with strong interpersonal skills and have the ability to get along well with people . I enjoy challenges and looking for creative solutions to problems. 2) Besides the details given in my resume, I believe in character values, vision and action. I am quick in learning from mistakes. I am confident that the various tests that you have conducted will corroborate my competencies apti

HR Interview Questions With Simple Answers - Top 30.

Here are some very important HR questions which are often asked during Interviews and I believe these answers can really help you to get through....... Click on them to view the answer: 1) Tell Me Something About Yourself ? 2) What Are Your Strengths? 3) What Are Your Weaknesses? 4) How Do You Handle Pressure / Can You Work Well Under Pressure? 5) What Are Your Short Term Goals? 6) What Are Your Long Term Goals? 7) Where Do You See After 5 Years? 8) Why Should We Hire You? 9) What Is Your Salary Expectation? 10) Why Do You Want To Leave Your Current Job? 11) Do You Prefer To Work Alone Or As A Team Player? 12) What Made You Choose Your Major / Stream? 13) Why Didn’t You Pursue A Career In Your Major / Stream? 14) Why Do You Want To Work For Us? 15) Are You Willing To Travel? 16) Are You Willing To Take Risks? 17) What Do You Know About This Company? 18) What Do You Seek From A Job? 19) How Do You Evaluate Success? 20) During Your Performance Rev

Sample Cover Letter / Job Application.

To The General Manager (HR) [ Name and Designation (Bold Words)] Infosys Limited Delhi – 110001 Uttam Agrawal Gandhi Chowk, Bhartee Street [ Name Bhawanipatna, Kalahandi Contact Address Orissa – 766001 Telephone No.] Ph. no - +91-9438170446 [Sub: Application for the position of ___________ in your esteemed organization.] Respected Sir, (Always use ‘Respected’) With reference to your advertisement dated 14th may’ 08 in The Times of India for the position of ___________ . I would like to place myself as a strong contender before you. OR This has reference to your advertisement dated 14th may’ 08 in The Times of India for the position of ____________. In the said connection I take this opportunity to apply for the said position as a strong contender. /*This is the Introduction i.e the first paragraph of your application/* ( Now the Second Paragraph is the Self Introduction) Try to start the second paragraph with the below mentioned lines: - I have the p

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