Data science/ML/AI on Telegram: “🗃 SQL has a trick beginners often miss Suppose…”

🗃 SQL has a trick beginners often miss

Suppose you want:

The top 3 customers by total spending.

You might write a complicated query.

But first think in two steps:
1. Calculate spending per customer

GROUP BY customer_id

2. Rank the result

ORDER BY total_spending DESC
LIMIT 3

So:

SELECT
    customer_id,
    SUM(amount) AS total_spending
FROM orders
GROUP BY customer_id
ORDER BY total_spending DESC
LIMIT 3;

The important idea isn't memorizing this query. It's learning to break SQL problems into: filter → group → calculate → sort → limit

Once you start thinking in those stages, complicated SQL questions become much easier to attack.

#SQL