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

Oracle (3253)
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 2156

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

1 1894

What is CRUD Operations?

1 1845

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

1 1984

How to Ensure Data Integrity in a Relational Database?

1971

Explain the Difference Between OLTP and OLAP Databases.

1 2243

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

1 2191

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

1 2071

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

1 2044

10 How to Handle Data Migration Between Different Databases?

1 2213

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

1 2996

Explain the Importance of Data Normalization.

1 978

How to Perform Data Cleaning and Preprocessing?

1 2959

What are the Common SQL Functions Used for Data Aggregation?

1 2794

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

1 2906

Un-Answered Questions { Databases }

Is mysql same as mariadb?

948

How do I open a pgadmin file in windows?

935

What is mysql database used for?

1090

Explain integrity constraints?

1157

Why cannot I use bind variables in ddl/scl statements in dynamic sql?

1262

What is nvarchar max in sql?

1072

How much money does a dba make?

625

How is foreign key commands related to primary key?

866

explain mysql aggregate functions. : Sql dba

1032

What is replication server in sybase?

895

How do convert or display the date or time as string?

1097

How can you determine what protocol is being used for interconnect traffic?

What are different types of receipt reversals ? Explain them : oracle accounts receivable

1319

Tab A A B ------ 1 A 2 B 3 C Tab B A B ----- 4 D 5 E 6 F Generate the value into B table from A table. Only table A has the value. Write the SQL query to get B table value.

1831

Can we perform dml in function?

1130

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