Day 20: COALESCE Function in SQL Explained with Examples | PostgreSQL Data Cleaning Tip πŸ’‘

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Welcome to Day 20 of my 30-Day SQL Challenge!
Today, I learned about the COALESCE() function in PostgreSQL β€” a key tool for handling NULL values in SQL queries.

🧠 What You'll Learn:
What is COALESCE() in SQL

Why NULL values can break your results

How to replace NULL with custom defaults

Real-world use cases (e.g. showing 0 instead of NULL in totals, fallback logic)

πŸ’» Practiced using PostgreSQL with pgAdmin.
This function is extremely useful in data cleaning, reporting, and dashboards for any data analyst!

πŸ”’ All data used is fictional and for educational use only
πŸ“… #Day20 of #30DayDataChallenge
πŸ“Ί Channel: Tech With Nicks

#Day20 #COALESCE #SQLChallenge #PostgreSQL #TechWithNicks #LearnSQL #DataCleaning #HandleNULL #pgAdmin #SQLforBeginners #30DaySQLChallenge



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