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

How to Optimize Database Queries for Performance?

1 2142

What are Stored Procedures and When would we Use Them?

1 2144

How to Handle Missing Data in a Database?

1 2001

Describe the Process of Feature Engineering using SQL.

1 944

What are the different types of databases?

1 1129

What are ACID properties in databases?

1 2265

What is the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN?

1 1116

What is indexing, and how does it improve performance?

1 1003

What is a deadlock in SQL? How can you prevent it?

1 2503

What is the CAP theorem?

1 1018

How would you optimize a slow SQL query?

1 2528

How do you handle duplicate records in a database?

1 985

How would you design a database for an e-commerce website?

1 987

How do you ensure database security?

1 1113

What would you do if a database crashes in production?

1 894

Un-Answered Questions { Databases }

What is external database?

814

Explain the difference between a FUNCTION, PROCEDURE and PACKAGE.

2275

What it means to be triggered?

910

What is a data collection table?

943

What information is maintained within the msdb database?

924

how to rename an existing column in a table? : Sql dba

958

How do I count duplicates in sql?

1027

Which are the olap features?

907

Can mongodb used for cache management?

Define union, union all, minus, intersect?

932

What type of database is postgres?

731

What are the vital features of sybase?

802

What is a snapshot log?

949

Explain the various tools used in etl?

Can you achieve primary key - foreign key relationships in mongodb?

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