Functions and Operators in PostgreSQL: Comparison Function & Operator | ...

In this video, we’ll dive into Comparison Functions and Operators in PostgreSQL. These are essential for writing precise queries, handling null values, and performing safe comparisons in your database applications.

You’ll learn:

• Basic comparison operators (<, >, =, <>, !=)

• Range testing with BETWEEN and NOT BETWEEN

• Using BETWEEN SYMMETRIC for unordered ranges

• NULL-safe comparisons with IS DISTINCT FROM and IS NOT DISTINCT FROM

• Checking for missing data with IS NULL, IS NOT NULL, and alternatives

• Boolean checks like IS TRUE, IS FALSE, and IS UNKNOWN

• Row-level null comparisons and their tricky behavior

• Handy functions like num_nulls() and num_nonnulls() for analyzing null values

We’ll also cover best practices, pitfalls, and performance tips to ensure your queries run efficiently while avoiding common mistakes with null handling and cross-type comparisons.

📌 This is part of the PostgreSQL Full Playlist, so make sure to check out the other videos if you want to master PostgreSQL step by step.