This is a compilation of all the questions and answers on Alisdair Owen's PostgreSQL Exercises.

Welcome to PostgreSQL Exercises! This site was born when I noticed that there's a load of material out there to help people learn about SQL, but not a great deal to make it easy to learn by doing. PGExercises provides a series of questions and explanations built on a single, simple dataset.

PostgreSQL Operators PostgreSQL SELECT PostgreSQL SELECT DISTINCT PostgreSQL WHERE PostgreSQL ORDER BY PostgreSQL LIMIT PostgreSQL MIN and MAX PostgreSQL COUNT PostgreSQL SUM PostgreSQL AVG PostgreSQL LIKE PostgreSQL IN PostgreSQL BETWEEN PostgreSQL AS PostgreSQL Joins PostgreSQL INNER JOIN PostgreSQL LEFT JOIN PostgreSQL RIGHT JOIN PostgreSQL FULL JOIN PostgreSQL CROSS JOIN PostgreSQL UNION PostgreSQL GROUP BY PostgreSQL HAVING PostgreSQL EXISTS PostgreSQL ANY PostgreSQL ALL PostgreSQL CASE ... Tip: Sign in to track your progress. ... If you haven't already, sign up to become a W3Schooler, and get points for every exercise you complete. As a logged on W3Schools user you will have access to many features like having your own web page, track your learning progress, receive personal guided paths, and more. The exercises are a mix of "multiple choice" and "fill in the blanks" questions.

October 30, 2025 - You may Download .tar.gz file and .zip file of the database (both structure and data) to practice on your local machine.  · Follow us on Facebook and Twitter for latest update.

May 6, 2026 - Write-Ahead Logging (WAL) in PostgreSQL is a method used to ensure data integrity. Before any changes are made to the database, the changes are first recorded in a log (WAL). This log helps in recovering the database to a consistent state in ...

July 23, 2025 - The section features 20 medium-level PostgreSQL questions designed to enhance your SQL skills through practical exercises. These questions cover various topics such as querying member borrowings, identifying the most popular books and authors, ...

February 10, 2025 - How do you optimize PostgreSQL for high-performance workloads? What are the best practices for setting up PostgreSQL replication?

December 29, 2025 - See also Top 20 OOPs ABAP Interview Questions and Answers · Describe the overall architecture of PostgreSQL. What is the role of the postmaster process in PostgreSQL? How does PostgreSQL handle concurrent connections?

This is a compilation of all the questions and answers on Alisdair Owen's PostgreSQL Exercises.

June 24, 2024 - Free PostgreSQL Practice Test Questions & Answers (2026)

June 1, 2026 - Thus, due to its huge popularity, there will be massive job opportunities in PostgreSQL and you can build a promising career. To help you in the interview process, we have curated the most common PostgreSQL interview questions with answers for all experience levels.

Improve your SQL database programming skills with 18 PostgreSQL practice exercises for beginners. ... Prepare for your SQL job interview by reviewing GROUP BY questions and how to answer them.

May 12, 2025 - Question: Write a SQL query to retrieve the first name, last name, and salary of all employees in the ‘Sales’ department. SELECT first_name, last_name, salary FROM employees WHERE department_id = (SELECT id FROM departments WHERE name = 'Sales');Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Answer...

Solidify your knowledge of using PostgreSQL queries! This online practice set is dedicated to users who know SQL basics.

January 3, 2026 - 100 free EDB PostgreSQL Professional 2026 practice questions. Partitioning, streaming replication, HA, Barman backup, EXPLAIN tuning, and Row Level Security.

February 17, 2025 - Here in this article, you will be able to gather the PostgreSQL MCQ Quiz that tests your comprehension of PostgreSQL’s design, SQL queries, data types, and other sophisticated capabilities. We’ll give you a complete set of PostgreSQL Multiple Choice Questions in this article so you can test your knowledge and be ready for examinations and interviews.

Here are the consolidated list of exercises covering all the key topics related to Postgresql to gain mastery over SQL. Ability to use native utilities to load data. Perform CRUD or DML Operations. Writing basic SQL queries. Creating Tables, Indexes and Constraints.

The test contains 25 questions and there is no time limit. The test is not official, it's just a nice way to see how much you know about PostgreSQL. You will get 1 point for each correct answer.

January 3, 2026 - Practice for the EDB Essentials for PostgreSQL Associate Certification with 200+ free questions. Detailed explanations help you learn from every mistake.

August 8, 2025 - This blog contains the top PostgreSQL Interview Questions and Answers in 2026 for freshers and experienced PostgreSQL developers, which will help in cracking the interviews with ease.