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。

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;

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