PostgreSQL Interview Questions 1. What is PostgreSQL and why it is used for? 2. What are the features of PostgreSQL? 3. How to install PostgreSQL on windows? 4. How to install PostgreSQL on Ubuntu? 5. List data type in PostgreSQL? 6. How to change the datatype of a column in Postgre...
The use of comparison operators like <,> or = can be done in a subquery. These kinds ofSQL Interview Questionsare a bit difficult to understand and answer accordingly. There are a lot ofSQL Interview Questionsapart from this, which the candidates must practice qualifying for the interview. Fo...
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Examples: MySQL, PostgreSQL, Oracle Database. Columnar Database: Storage: Stores data column-by-column, which allows for efficient read operations, especially for analytical queries that involve aggregate functions on large datasets. Access Pattern: Optimized for read-heavy workloads and OLAP (Online ...
A few popular examples are MySQL, PostgreSQL, Microsoft Access, SQL Server, FileMaker, and Oracle. 3. What is Object-Relational Mapping? Object-Relational Mapping (ORM)is a tool that lets you query and manipulates data from a database using an object-oriented programming language such as Java...
Structured data: Schema-based data, Datastore in SQL, Postgresql databases etc Semi-structured data : Json objects , json arrays, csv , txt ,xlsx files,web logs ,tweets etc Unstructured data : Audio, Video files, etc FREE eBook on 250 Hadoop Interview Questions and Answers 6. On what conce...
ports: - "5000:5000" depends_on: - db db: image: postgres volumes: - db-data:/var/lib/postgresql/data volumes: db-data: Powered By This file defines two services, web and db, with networking and volume configurations. 8. Why do we use volumes in Docker? We use Docker volumes to...
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SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in relational database.SQL can be used in different languages or database management systems like Oracle,SQL Server,Postgresql. ...
Database-related questions revolve around topics like data modeling, SQL or NoSQL databases, query optimization, and database connection handling in Node JS. Candidates are expected to demonstrate their knowledge of various database systems such as MongoDB, MySQL, PostgreSQL, or Redis, and explain...