Скачать или смотреть How to calculate running totals

Ever struggled with calculating running totals or cumulative sums in SQL? 🤔 It's a common task, from tracking monthly revenue to user activity over time.

The secret is the powerful `SUM() OVER()` window function! 🚀

Swipe through to see how it works:
1️⃣ The Basic Hook: What's the magic behind rolling sums?
2️⃣ Syntax Breakdown: A simple look at `SUM() OVER (PARTITION BY ... ORDER BY ...)`.
3️⃣ Example 1: A straightforward running total of monthly sales.
4️⃣ Example 2: Using `PARTITION BY` to create separate running totals for different categories (like products).

By mastering this one function, you can level up your SQL analytics game significantly. It's more efficient and cleaner than complex self-joins or cursors.

Save this post for your next data analysis session so you have the syntax ready to go! 💾

What other SQL window functions do you want to learn about? Let me know in the comments! 👇

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