Databases Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Oracle (3259)
SQL Server (4518)
MS Access (429)
MySQL (1402)

Postgre (483)
Sybase (267)
DB Architecture (141)
DB Administration (291)

DB Development (113)
SQL PLSQL (3330)
MongoDB (502)
IBM Informix (50)

Neo4j (82)
InfluxDB (0)
Apache CouchDB (44)
Firebird (5)

Database Management (1411)
Databases AllOther (288)

Databases Interview Questions

Questions Answers Views Company eMail

What is a Database Schema and Why is It Important?

1 1954

Explain the Difference Between a Primary Key and a Foreign Key.

1 1720

What is CRUD Operations?

1 1679

What are the Different Types of Joins and How do They Work?

1 1805

How to Ensure Data Integrity in a Relational Database?

1854

Explain the Difference Between OLTP and OLAP Databases.

1 1999

What are the ACID Properties in a Database and Why are They Important?

1 2011

Describe the Process of ETL (Extract, Transform, Load).

1 1894

What is a Data Warehouse and How is it Different from a Traditional Database?

1 1869

10 How to Handle Data Migration Between Different Databases?

1 2012

What is a Relational Database and How does it Differ from a NoSQL Database?

1 2223

Explain the Importance of Data Normalization.

1 830

How to Perform Data Cleaning and Preprocessing?

1 2159

What are the Common SQL Functions Used for Data Aggregation?

1 2199

Describe the Process of Connecting a Database to a Data Analysis Tool.

1 2218

Un-Answered Questions { Databases }

Name the three major set of files on disk that compose a database in Oracle?

1073

How can we check the sql server version?

993

Is left join inner or outer by default?

977

How to define an anonymous procedure with variables?

1074

What is the best free sql database?

1008

Is microsoft access an sql database?

827

what is the difference between substr and instr function in oracle?

1042

What is the use of partition by in sql server?

886

What is role playing dimension with two examples? : sql server analysis services, ssas

960

how to dump a table to a file with 'mysqldump'? : Sql dba

992

Explain what is a column in a table?

1052

What is the placeholder column?

How can you know that statistics should be updated?

1033

What is the difference between primary key and candidate key?

950

Give any 6 data types of MongoDB?

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