[英]Select date/time groupings in MySQL grouped by hour
我在mysql表中有一堆日期數據,如下所示:
2010-02-13 1:00:00, "soma data"
2010-02-13 1:25:00, "soma data"
2010-02-13 1:37:00, "soma data"
2010-02-13 2:12:00, "soma data"
我想選擇一個顯示按小時分組的數據的報告,例如:
On Feb 13, during the hour from 1:00 pm to 1:59 pm, there were 3 data points.
On Feb 13, during the hour from 2:00 pm to 2:59 pm, there was 1 data points.
...
基本上我想報告一天中每小時發生的累計記錄數量。 所以最終結果會給我一個10天的報告,以24小時為增量進行分解,這樣我就可以看到在任何給定的一天中任何給定時間內有多少數據。
TIA,希望你能幫忙!
您可能希望使用GROUP BY
子句,如以下查詢中所示:
SELECT
COUNT(*),
YEAR(dateTimeField),
MONTH(dateTimeField),
DAY(dateTimeField),
HOUR(dateTimeField)
FROM
yourTable
WHERE
dateTimeField >= '2010-02-04 00:00:00' AND
dateTimeField < '2010-02-14 00:00:00'
GROUP BY
YEAR(dateTimeField),
MONTH(dateTimeField),
DAY(dateTimeField),
HOUR(dateTimeField);
您可能還需要查看MySQL文檔以獲取有關日期和時間函數的更多參考:
SELECT HOUR(datetime), COUNT(*)
FROM table
GROUP BY HOUR(datetime);
您將獲得兩個字段:小時和該小時內的事件數。
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