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 1960

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

1 1725

What is CRUD Operations?

1 1679

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

1 1812

How to Ensure Data Integrity in a Relational Database?

1856

Explain the Difference Between OLTP and OLAP Databases.

1 1999

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

1 2014

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

1 1895

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

1 1874

10 How to Handle Data Migration Between Different Databases?

1 2017

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

1 2244

Explain the Importance of Data Normalization.

1 833

How to Perform Data Cleaning and Preprocessing?

1 2179

What are the Common SQL Functions Used for Data Aggregation?

1 2218

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

1 2244

Un-Answered Questions { Databases }

How do I open sybase control center?

901

What is datadir?

828

Describe the difference between embedded and dynamic sql.

1017

what are the different tables present in mysql? : Mysql dba

943

How many indexes does mongodb create by default for a new collection?

how would you convert a secondary server into a primary server ?

177

How to make a column bigger and delete unique from table.

898

Can we debug stored procedure?

966

What is data sparsity and how it effect on aggregation?

877

Can you tell a way to know the number of days between the two given dates in php?

1026

Which date function is used to find the difference between two dates?

536

List out the different types of locks available in sql server?

940

what happens when the column is set to auto increment and you reach the maximum value for that table? : Sql dba

985

what are date and time functions in mysql? : Sql dba

936

How do I view a sql trace file?

972

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