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如何更改下面的查詢獲得2小時,而不是1MySQL查詢從小時至2小時
SELECT DATE_FORMAT(x.time,'%Y-%m-%d %H:00:00')
, avg(Ph) avg_Ph
FROM Ph x where time >= NOW() - INTERVAL 1 DAY
GROUP
BY DATE_FORMAT(x.time,'%Y-%m-%d %H:00:00');