AVG(val) OVER (PARTITION BY subject ORDER BY time
ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING)
含義是按照time排序，前后1行加自己后的平均數(shù)。

SELECT time, subject, val, SUM(val) OVER (PARTITION BY subject ORDER BY time ROWS UNBOUNDED PRECEDING) AS running_total, AVG(val) OVER (PARTITION BY subject ORDER BY time ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) AS running_average FROM observations;

總結(jié)

以上是生活随笔為你收集整理的MySQL 窗函数 流动平均数 running average的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。