Moving average of Russian medals
Using frames with aggregate window functions allow you to calculate many common metrics, including moving averages and totals. These metrics track the change in performance over time.
Bu egzersiz, kursun bir parçasıdır
PostgreSQL Summary Stats and Window Functions
Egzersiz talimatları
- Calculate the 3-year moving average of medals earned.
Uygulamalı etkileşimli egzersiz
Bu egzersizi bu örnek kodu tamamlayarak deneyin.
WITH Russian_Medals AS (
SELECT
Year, COUNT(*) AS Medals
FROM Summer_Medals
WHERE
Country = 'RUS'
AND Medal = 'Gold'
AND Year >= 1980
GROUP BY Year)
SELECT
Year, Medals,
--- Calculate the 3-year moving average of medals earned
___ OVER
(ORDER BY Year ASC
ROWS BETWEEN
___ AND ___) AS Medals_MA
FROM Russian_Medals
ORDER BY Year ASC;