How to identify duplicate keys in a join

Описание: Your SQL join multiplying rows unexpectedly? 🤯 That's an 'exploding join', and it's usually caused by duplicate keys.

This common headache can skew your analysis and lead to incorrect results. But don't worry, there's a simple detective trick to find the culprit! 🕵️‍♂️

Swipe through to learn the powerful `GROUP BY` + `HAVING` technique to quickly identify duplicate keys in your tables before you join. Save this post for your next data deep-dive!

Have you ever faced an exploding join? Share your story in the comments! 👇

#Shorts #sql #dataanalytics #datascience #sqltips #dataengineering #businessintelligence #bigdata #postgresql #mysql #techtips #learntocode #dataanalysis #database #developer