Question

我试图在预定义的时间段内检索每个24小时期间值字段的范围。问题是时间段是第二天早上7点到早上7点之间。（不是每日图）

例如，我想要第1天的范围，然后第2天的范围，等等。我尝试使用以下查询，但生产字段不断回来使用相同的数据，任何人都可以请一些关于我怎么能做这个工作？

非常感谢你。

select tagname, convert(date,datetime),

(
select (max(Value)-min(Value)) as Range
from Runtime.dbo.AnalogHistory
where (TagName = 'LS_CV004_WX1_PROD_DATA.Actual_Input')
and DateTime BETWEEN dateadd(hh,7,convert(datetime,convert(date,datetime))) AND dateadd(hh,31,convert(datetime,convert(date,datetime)))
) as Production

from runtime.dbo.analoghistory
where (TagName = 'LS_CV004_WX1_PROD_DATA.Actual_Input')
and datetime between '20151101' and '20151201'
group by tagname, convert(date,DateTime)

我希望结果如下

标记名|日期|生产

Answer 1

下面是一种方法，它使用CTE为指定范围内的每个日期生成一行，然后在日期和7小时偏移量上连接到表。考虑为此类任务创建实用程序日历表。

DECLARE 
      @StartDate date = '20151101'
    , @EndDate date = '20151201';
WITH 
      t8 AS (SELECT n FROM (VALUES(0),(0),(0),(0),(0),(0),(0),(0)) t(n))
    , t512 AS (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 0)) - 1 AS num FROM t8 AS a CROSS JOIN t8 AS b CROSS JOIN t8 AS c)
    , dates AS (SELECT DATEADD(day, num, @StartDate) AS Date FROM t512 WHERE num <= DATEDIFF(day, @StartDate, @EndDate))
SELECT TagName, Date, MAX(Value)-MIN(Value) as Production
FROM dates
JOIN dbo.AnalogHistory ON 
    AnalogHistory.DateTime >= DATEADD(hour, 7, Date)
    AND AnalogHistory.DateTime < DATEADD(hour, 31, Date)
GROUP BY TagName, Date
ORDER BY TagName, Date;

Answer 2

您的子查询与外部查询没有关联，因此它返回相同的值也就不足为奇了。我想你想要这样的东西：

select tagname, convert(date, datetime),
       (select (max(ah2.Value) - min(ah2.Value)) as Range
        from Runtime.dbo.AnalogHistory ah2
        where ah2.TagName = 'LS_CV004_WX1_PROD_DATA.Actual_Input' and
              ah2.DateTime BETWEEN dateadd(hour, 7, convert(datetime, convert(date, ah.datetime))) AND 
                             dateadd(hour, 31, convert(datetime, convert(date, ah.datetime)))
       ) as Production
from runtime.dbo.analoghistory ah
where TagName = 'LS_CV004_WX1_PROD_DATA.Actual_Input' and
      datetime between '20151101' and '20151201'
group by tagname, convert(date, DateTime);

请注意在子查询中使用ah2和ah。

MSSQL查询范围超过一个月的一天

2 个答案: