The SQL Query That Replaced 10 Lines of Code

ost analysts write running totals using a self-join. It works — but it's slow, messy, and painful to read.

There's a better way: SUM() OVER (ORDER BY month)

One window function. No join. No subquery. Same result.

Use it for:

Running totals
Moving averages
Percent of total
Save this. Window functions are one of the most underused tools in SQL — and once you learn them, you'll use them everywhere.

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Видео The SQL Query That Replaced 10 Lines of Code канала Ofcourse Data