在SQL Server中，在给定每日每小时数据的情况下，如何在上午8点到晚上8点的12小时范围内平均每小时间隔数据？

我的数据库中有以下格式的每小时间隔数据：

EFFECTIVEDATETIME       NEW_YORK ETC...                
---------------------------------------
2017-01-01 01:00:00.000 44
2017-01-01 02:00:00.000 44
2017-01-01 03:00:00.000 45
2017-01-01 04:00:00.000 44
2017-01-01 05:00:00.000 45
2017-01-01 06:00:00.000 44
2017-01-01 07:00:00.000 44
2017-01-01 08:00:00.000 44
2017-01-01 09:00:00.000 44
2017-01-01 10:00:00.000 46
2017-01-01 11:00:00.000 45
2017-01-01 12:00:00.000 46
2017-01-01 13:00:00.000 47
2017-01-01 14:00:00.000 47
2017-01-01 15:00:00.000 47
2017-01-01 16:00:00.000 47
2017-01-01 17:00:00.000 46
2017-01-01 18:00:00.000 45
2017-01-01 19:00:00.000 43
2017-01-01 20:00:00.000 41
2017-01-01 21:00:00.000 42
2017-01-01 22:00:00.000 42
2017-01-01 23:00:00.000 41

我试图将纽约和以下专栏的平均值仅用于特定范围，从08:00:00.000到20:00:000。我可以用下面的代码做一整天。然而，我更希望能够平均我的数据，只有12小时的时间。任何帮助都将不胜感激，谢谢

SELECT 
    CAST(EFFECTIVEDATETIME AS DATE) AS EFFECTIVE_DATE,
    AVG(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN TEMPERATURE ELSE NULL END) AS NEW_YORK,
    AVG(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN DEWPOINT ELSE NULL END) AS NEW_YORK_DEWPOINT,
    AVG(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN RelativeHumidity ELSE NULL END) AS NEW_YORK_HUMIDITY,
    MAX(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN TEMPERATURE ELSE NULL END) AS NEW_YORK_DAILY_MAX,
    MIN(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN TEMPERATURE ELSE NULL END)  AS NEW_YORK_DAILY_MIN
FROM
    DBO.WeatherHourly
WHERE
    EffectiveDateTime > '2017-01-01'
GROUP BY 
    CAST(EFFECTIVEDATETIME AS DATE)
ORDER BY 
    EFFECTIVE_DATE

---

您可以在

WHERE

子句中添加一个过滤条件：

SELECT CAST(EFFECTIVEDATETIME AS DATE) AS EFFECTIVE_DATE,
    AVG(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN TEMPERATURE ELSE NULL END) AS NEW_YORK,
    AVG(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN DEWPOINT ELSE NULL END) AS NEW_YORK_DEWPOINT,
    AVG(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN RelativeHumidity ELSE NULL END) AS NEW_YORK_HUMIDITY,
    MAX(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN TEMPERATURE ELSE NULL END) AS NEW_YORK_DAILY_MAX,
    MIN(CASE WHEN WEATHERSTATIONID = 'KNYC' THEN TEMPERATURE ELSE NULL END)  AS NEW_YORK_DAILY_MIN
FROM DBO.WeatherHourly
WHERE EffectiveDateTime > '2017-01-01' AND DATEPART(hour, EffectiveDateTime) BETWEEN 8 AND 19
GROUP BY CAST(EFFECTIVEDATETIME AS DATE)
ORDER BY EFFECTIVE_DATE

---

如果要将开始时间限制为间隔，可以使用：

WHERE EffectiveDateTime > '2017-01-01' AND
      CAST(EffectiveDateTime as TIME) BETWEEN '08:00:00' AND '20:00:00'

---

如果您还想对结束日期/时间进行限制，那就更具挑战性了。

我删除了不一致的数据库标记。请仅使用您真正使用的数据库进行标记。不是100%清楚，但如果您在effectiveDateTime上添加时间检查，使其仅包括8到20小时之间的时间，您应该会得到您想要的谢谢！我不知道你可以添加and语句并以这种方式进行过滤谢谢你兄弟-对之前的标签道歉！