Stop Using SELECT DISTINCT to hide duplicates

Stop adding DISTINCT just to remove duplicates! 😱 It's a performance killer and hides logic errors. Learn why EXISTS or GROUP BY is the better solution.

What we cover:

The Trap: Joining tables you don't need (1:N relationship) creates duplicates.
The Lazy Fix: Adding DISTINCT forces the DB to sort and de-duplicate (slow!).
The Solution: Use WHERE EXISTS to filter or GROUP BY to summarize.
Write better logic, not patches! 🚀

#SQL #Database #Performance #CodingTips #LearnSQL #DataEngineering #Programming #SQLQuery #SelectDistinct

Видео Stop Using SELECT DISTINCT to hide duplicates канала LogicLayers