Database interview questions and answers

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Database interview questions and answers


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1.Define Fact tables and dimension tables.

Fact tables are central tables in data warehousing. They contain the aggregate values that are used in business process.............. 
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2.Explain the ETL process in Data warehousing.

Extraction, Transformation and loading are different stages in data warehousing................
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3.What is Data mining?

Data mining is a process of analyzing current data and summarizing the information in more useful manner..................
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4.What are indexes?

Index can be thought as index of the book that is used for fast retrieval of information. 
Index uses one or more column index keys and pointers to the record to locate record............... 
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5.Explain the types of indexes?

Clustered index
Non-clustered..................... 
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6.Define SQL.

SQL stands for Structured Query Language. It allows access, insert/update/delete records and retrieve data from the database...................
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7.What is RDBMS? Explain its features.

RDBMS stands for Relational Database Management System. It organizes data into related rows and columns...................
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8.What is an Entity-Relationship diagram?

It is a graphical representation of tables with the relationship between them................
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9.Define referential integrity.

It is the rules that are applied when the relationships are created. It ensures integrity of data and prevents inconsitent data into the tables...............
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10.Define Primary key and Foreign key.

A column or combination of columns that identify a row of data in a table is Primary Key............
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11.Define alternate key.

There can be a key apart from primary key in a table that can also be a key. This key may or may not be a unique key..............
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Database interview questions- April 06, 2009, 17:40 pm by Nishant Kumar

Delete vs. Truncate table.

Delete logs the deletion of each row whereas Truncate doesn't log deleted rows in the transaction log. This makes truncate command is bit faster than Delete command.

Define constraints.

Constraints enforce integrity of the database. Constraints can be of following types

Not Null
Check
Unique
Primary key
Foreign key

Database interview questions- April 12, 2009, 14:50 pm by Nishant Kumar

Define stored procedure.

Stored procedure is a set of pre-compiled SQL statements, executed when it is called in the program.

Define Trigger.

Triggers are similar to stored procedure except it is executed automatically when any operations are occurred on the table.

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SQL levels

I am watching your website. It's nice. I want some details. I think I saw in your website, about SQL Levels. ie. Beginner level, Intermediate level, Advanced level of learning. or so. I did not remember correctly. If I am correct, please inform me about these details. I want to learn basics very well. Please reply me.I am not knowing where to start and how to start SQL. That's why I am asking you. Please help me

madhu 06-7-2013 07:57 AM

Database interview

Thanks for all these questions on database. Please upload more questions.

dighe 03-11-2013 01:40 AM

database

the quation hav't answer

haylay 02-13-2013 02:31 AM

good

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javed 03-13-2012 10:41 AM

 

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Define Truncate and Delete commands.

Answer - Truncate command is used to remove all rows of the column.The removed records are not recorded in the transaction log......

Define Primary and Unique key.

Answer - The column or columns of the table whose value uniquely identifies each row in the table is called primary key. You can define column as primary key using primary key constraint while you create table.....

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Answer - Index can be thought as index of the book that is used for fast retrieval of information. Index uses one or more column index keys and pointers to the record to locate record.........

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