[英]Grouping with SQL using Max, Min, Avg and dates
看来您知道该怎么做,所以我想您唯一缺少的是您需要从日期中删去时间值,因此每一天都将被识别为一组。 您可以使用CAST AS DATE
SELECT cast([dateTime] as date) as Your_Date,ChannelID,
max(reading) as max_reading,
min(reading) as min_reading,
avg(reading) as avg_reading
FROM YourTable
GROUP BY cast([dateTime] as date) ,ChannelID
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