Functions and Operators in PostgreSQL: Logical Operators || PostgreSQL F...

In this video, we dive into Logical Operators in PostgreSQL, an essential part of writing powerful and efficient queries. Logical operators help us combine multiple conditions and make decisions in our SQL statements.

We’ll cover the three main operators — AND, OR, and NOT — along with PostgreSQL’s three-valued logic system (TRUE, FALSE, and NULL). You’ll also learn how these operators work through truth tables and practical examples using an employees table.

📌 What you’ll learn in this video:

• Introduction to PostgreSQL Logical Operators

• Detailed explanation of AND, OR, and NOT

• How NULL affects logical operations

• Using logical operators in WHERE clauses

• Real-world examples with CREATE TABLE and INSERT statements

By the end of this tutorial, you’ll have a strong understanding of how logical operators work in PostgreSQL, enabling you to write more accurate and efficient queries.

👉 Don’t forget to check out the Full PostgreSQL Playlist for a complete step-by-step guide on mastering PostgreSQL.

Data Types in PostgreSQL: Date/Time/Interval Data Types || PostgreSQL Fu...

Welcome to Episode 49 of the PostgreSQL Full Playlist! In this tutorial, we explore one of the most important areas of database development — Date/Time and Interval Data Types in PostgreSQL.

PostgreSQL provides highly flexible and powerful temporal data types including DATE, TIME, TIMESTAMP, TIMESTAMPTZ, and INTERVAL. Whether you're handling simple dates, calculating durations, or dealing with timezone-aware timestamps, this video will guide you through all the critical concepts with real-world use cases, hands-on SQL examples, and expert-level insights.

You will learn:

• The difference between TIMESTAMP and TIMESTAMPTZ

• How to use and format INTERVAL for date arithmetic

• How time zone conversion works using AT TIME ZONE

• Date formatting with datestyle and intervalstyle

• Special constants like now, epoch, today, and yesterday

• Functions like CURRENT_DATE, DATE_TRUNC, EXTRACT, and more!

💡 This video is perfect for:

• Students learning databases

• Backend developers handling temporal data

• Data engineers dealing with time-series data

• Anyone preparing for SQL interviews or certifications

👉 Don’t forget to LIKE, SUBSCRIBE, and SHARE if you find this helpful. Drop your questions or feedback in the comments — I’d love to help out!

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LIMIT and OFFSET in PostgreSQL Queries || Queries in PostgreSQL || Postg...

Welcome to Lesson #40 in our PostgreSQL Full Playlist! In this video, we explore the powerful LIMIT and OFFSET clauses in PostgreSQL and how they help control the number of rows returned from a query. Whether you're building a backend for a web app or optimizing your data reports, mastering these clauses is essential.

We begin by understanding the syntax of LIMIT and OFFSET, followed by real-world examples using an employees table. You’ll learn how to:

• Return a specific number of rows

• Skip rows using OFFSET

• Combine both for pagination

• Use ORDER BY to ensure consistent and predictable results

We’ll also walk through advanced techniques like using CTEs (Common Table Expressions) for more powerful and flexible pagination with ROW_NUMBER().

🔍 Performance Alert: Learn why high OFFSET values can hurt performance and how to implement keyset pagination for large datasets.

Perfect for students, backend developers, and data analysts who want clean, performant SQL!

📌 Chapters:
0:00 - Introduction
1:10 - What is LIMIT and OFFSET?
2:45 - Creating the Employees Table
4:20 - LIMIT Examples
6:00 - OFFSET Examples
7:00 - Pagination with LIMIT & OFFSET
8:00 - Real-World Pagination Scenario
9:20 - Performance Notes & Keyset Pagination
11:00 - Using CTEs with ROW_NUMBER
12:30 - Conclusion

💡 Subscribe and turn on notifications so you don’t miss the next video: VALUES Lists in PostgreSQL!