PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness.

The best way we learn anything is by practice and exercise questions. We have started this section for those (beginner to intermediate) who are familiar with SQL and PostgreSQL. Hope, these exercises help you to improve your PostgreSQL query skills. Currently, following sections are available, we are working hard to add more exercises. Happy Coding!

**List of PostgreSQL Exercises**

- PostgreSQL Create Table statement [19 Exercises]
- PostgreSQL Alter Table statement [13 Exercises]
- PostgreSQL Update Table statement [8 Exercises]
- PostgreSQL Insert Into statement [13 Exercises]
- PostgreSQL Basic SELECT statement [19 Exercises]
- PostgreSQL Restricting and Sorting Data [11 Exercises with Solutions]
- PostgreSQL Aggregate Functions and Group by [14 Exercises with Solutions]
- PostgreSQL String Functions [14 Exercises with Solution]
- PostgreSQL JOINS [13 Exercises with Solution]
- PostgreSQL Subqueries [21 Exercises with Solution ]
- More to come!

**Structure of 'hr' database : **

**List of Exercises with Solutions :**

- HTML CSS Exercises, Practice, Solution
- JavaScript Exercises, Practice, Solution
- jQuery Exercises, Practice, Solution
- jQuery-UI Exercises, Practice, Solution
- CoffeeScript Exercises, Practice, Solution
- Twitter Bootstrap Exercises, Practice, Solution
- C Programming Exercises, Practice, Solution
- C# Sharp Programming Exercises, Practice, Solution
- PHP Exercises, Practice, Solution
- Python Exercises, Practice, Solution
- Java Exercises, Practice, Solution
- SQL Exercises, Practice, Solution
- MySQL Exercises, Practice, Solution
- PostgreSQL Exercises, Practice, Solution
- SQLite Exercises, Practice, Solution
- MongoDB Exercises, Practice, Solution
- Euler Project