How to handle NULL in window function trick that most SQL users completely miss.
You might be using COALESCE and thinking your query is correct…
but the real problem is how your window function is processing NULLs.
In this video, you’ll learn:
Why COALESCE doesn’t actually fix the issue
The hidden mistake in LAST_VALUE
And the correct way to use IGNORE NULLS
This is one of those small changes
that turns your SQL from basic to business-ready.
If you want to go deeper into real-world SQL concepts,
grab a copy of my book Mastering SQL Window Functions 📘
https://dataprofy.com/product-category/ebook/
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