Non-Correlated Subqueries III

This is a part of the example code. I am quite confused by the COUNT(*). As the * means “all” in SQL, what does this * cover? Does it count all the month, week, and date? Or just the date?

SELECT dep_month,
COUNT(*) AS flight_count
FROM flights
GROUP BY 1,2,3;

It may be a count of the rows?

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