Question

（鉴于此数据库SQL Fiddle）

如何在下面查询中的where where子句之外选择之前的VALUE？

如果可以，它将消除我在VBA excel ADODB宏中查找此值所需的其他查询。因为我目前循环，但扩展我的“TIMESTAMPEEN TIMESTAMP和TIMESTAMP”搜索指数，直到找到时间戳记的值。

如果我在第一个时间间隔开始时没有真正的VALUE，那么最终选择语句中的时间加权平均值（TWA）将不准确。（中间的所有其他时间间隔都正常，查询运行正常）。推送到我的Oracle 11GR1实例的数据是随机的，根本不知道这可能存在大的间隙。因此，数值不会出现数小时，数天，数月或有时甚至数年。

 -- Lets Begin the Query
 WITH INPUTS AS ( 
    SELECT RECNM, 
          TO_TIMESTAMP_TZ ( '15-01-01 00:10:00 AMERICA/LOS_ANGELES','RR-MM-DD HH24:MI:SS TZR' ) AS START_TIME,
          TO_TIMESTAMP_TZ ( '15-01-01 00:30:59 AMERICA/LOS_ANGELES','RR-MM-DD HH24:MI:SS TZR' ) AS END_TIME
    FROM POINTS
  WHERE ACRONYM = 'WELL32-PSI'  
) ,
ALL_INTERVALS AS ( 
    SELECT RECNM,
         START_TIME + NUMTODSINTERVAL ( ( LEVEL-1 ) , 'MINUTE' ) AS TIME
    FROM INPUTS
    CONNECT BY
    LEVEL-1 <=
               EXTRACT ( DAY FROM END_TIME - START_TIME ) * 24 * 60 +
               EXTRACT ( HOUR FROM END_TIME - START_TIME ) * 60 +
               EXTRACT ( MINUTE FROM END_TIME - START_TIME )
) ,
ALL_TIMES AS ( 
    SELECT 
       TIME, 
       VALUE, 
       1 AS HAS_VALUE
    FROM HST H
    INNER JOIN INPUTS I
        ON ( H.RECNM = I.RECNM
        AND H.TIME BETWEEN CAST ( I.START_TIME AS TIMESTAMP ) 
        AND  CAST ( I.END_TIME AS TIMESTAMP ) ) 
    UNION ALL
    SELECT 
       TIME, 
       NULL, 
       0
    FROM ALL_INTERVALS
    ORDER BY TIME,1, 2 NULLS FIRST 
) ,
LEAD_LAG_TIMES AS ( 
    SELECT 
         TIME,
         LAST_VALUE ( VALUE IGNORE NULLS ) OVER ( ORDER BY TIME ASC, VALUE ASC ) AS VALUE,
         24 * 60 * 60 * EXTRACT ( DAY FROM LEAD ( TIME ) OVER ( ORDER BY TIME ASC,VALUE ASC ) -TIME ) +
              60 * 60 * EXTRACT ( HOUR FROM LEAD ( TIME ) OVER ( ORDER BY TIME ASC,VALUE ASC ) -TIME ) +
                   60 * EXTRACT ( MINUTE FROM LEAD ( TIME ) OVER ( ORDER BY TIME ASC,VALUE ASC ) -TIME ) + 
                        EXTRACT ( SECOND FROM LEAD ( TIME ) OVER ( ORDER BY TIME ASC,VALUE ASC ) -TIME ) AS DURATION
    FROM ALL_TIMES 
) 
SELECT CAST ( TRUNC ( TIME,'MI' ) AS TIMESTAMP WITH TIME ZONE ) AS TIME,
    SUM ( VALUE * DURATION ) / SUM ( DURATION ) AS TWA,
    SUM ( DURATION ) AS TOTAL_DURATION 
FROM LEAD_LAG_TIMES
GROUP BY CAST ( TRUNC ( TIME,'MI' ) AS TIMESTAMP WITH TIME ZONE ) 
ORDER BY TIME ASC

实施例

 2015-01-01 00:00:00 AMERICA/LOS_ANGELES     63.3
 2015-01-01 00:00:08 AMERICA/LOS_ANGELES     63.7
 2015-01-01 00:00:17 AMERICA/LOS_ANGELES     64.6
 2015-01-01 00:00:28 AMERICA/LOS_ANGELES     66.3
 2015-01-01 00:00:45 AMERICA/LOS_ANGELES     66.8
 2015-01-01 00:00:55 AMERICA/LOS_ANGELES     67.5
 2015-01-01 00:01:11 AMERICA/LOS_ANGELES     67.0
 2015-01-01 00:01:30 AMERICA/LOS_ANGELES     67.4
 2015-01-01 00:01:40 AMERICA/LOS_ANGELES     67.9
 2015-01-01 00:01:50 AMERICA/LOS_ANGELES     68.7
 2015-01-01 00:02:01 AMERICA/LOS_ANGELES     68.2
 2015-01-01 00:02:11 AMERICA/LOS_ANGELES     67.1
 2015-01-01 00:02:21 AMERICA/LOS_ANGELES     66.5
 2015-01-01 00:02:31 AMERICA/LOS_ANGELES     65.5
 2015-01-01 00:02:46 AMERICA/LOS_ANGELES     65.0
 2015-01-01 00:02:59 AMERICA/LOS_ANGELES     64.6
 2015-01-01 00:03:15 AMERICA/LOS_ANGELES     64.1
 2015-01-01 00:03:25 AMERICA/LOS_ANGELES     63.2
 2015-01-01 00:03:35 AMERICA/LOS_ANGELES     62.7
 2015-01-01 00:04:05 AMERICA/LOS_ANGELES     62.2
 2015-01-01 00:04:32 AMERICA/LOS_ANGELES     61.8
 2015-01-01 00:05:40 AMERICA/LOS_ANGELES     61.3
 2015-01-01 00:05:55 AMERICA/LOS_ANGELES     60.8-----Not Included in where between but this value is needed
 2015-01-01 00:10:20 AMERICA/LOS_ANGELES     60.3--------- Included in where between
 2015-01-01 00:10:38 AMERICA/LOS_ANGELES     60.9
 2015-01-01 00:10:48 AMERICA/LOS_ANGELES     61.3
 2015-01-01 00:10:58 AMERICA/LOS_ANGELES     61.8
 2015-01-01 00:11:27 AMERICA/LOS_ANGELES     62.3
 2015-01-01 00:13:54 AMERICA/LOS_ANGELES     61.8
 2015-01-01 00:14:10 AMERICA/LOS_ANGELES     61.4
 2015-01-01 00:14:41 AMERICA/LOS_ANGELES     60.9
 2015-01-01 00:15:18 AMERICA/LOS_ANGELES     61.4
 2015-01-01 00:15:51 AMERICA/LOS_ANGELES     60.9
 2015-01-01 00:16:19 AMERICA/LOS_ANGELES     60.4
 2015-01-01 00:16:32 AMERICA/LOS_ANGELES     59.9
 2015-01-01 00:17:04 AMERICA/LOS_ANGELES     59.4
 2015-01-01 00:17:27 AMERICA/LOS_ANGELES     59.9
 2015-01-01 00:17:37 AMERICA/LOS_ANGELES     59.4
 2015-01-01 00:17:58 AMERICA/LOS_ANGELES     59.0
 2015-01-01 00:18:22 AMERICA/LOS_ANGELES     59.4
 2015-01-01 00:18:50 AMERICA/LOS_ANGELES     59.9
 2015-01-01 00:19:00 AMERICA/LOS_ANGELES     60.3
 2015-01-01 00:19:25 AMERICA/LOS_ANGELES     60.8
 2015-01-01 00:19:34 AMERICA/LOS_ANGELES     61.4
 2015-01-01 00:19:45 AMERICA/LOS_ANGELES     62.1
 2015-01-01 00:19:55 AMERICA/LOS_ANGELES     62.5
 2015-01-01 00:20:30 AMERICA/LOS_ANGELES     63.0
 2015-01-01 00:20:51 AMERICA/LOS_ANGELES     63.5
 2015-01-01 00:21:03 AMERICA/LOS_ANGELES     63.9
 2015-01-01 00:22:04 AMERICA/LOS_ANGELES     64.4
 2015-01-01 00:22:28 AMERICA/LOS_ANGELES     64.8
 2015-01-01 00:23:17 AMERICA/LOS_ANGELES     64.4
 2015-01-01 00:23:27 AMERICA/LOS_ANGELES     63.9
 2015-01-01 00:24:31 AMERICA/LOS_ANGELES     63.4
 2015-01-01 00:26:06 AMERICA/LOS_ANGELES     63.0
 2015-01-01 00:27:20 AMERICA/LOS_ANGELES     62.5
 2015-01-01 00:27:30 AMERICA/LOS_ANGELES     61.9
 2015-01-01 00:28:08 AMERICA/LOS_ANGELES     62.4
 2015-01-01 00:28:37 AMERICA/LOS_ANGELES     62.0
 2015-01-01 00:29:21 AMERICA/LOS_ANGELES     62.5
 2015-01-01 00:29:38 AMERICA/LOS_ANGELES     62.9
 2015-01-01 00:31:27 AMERICA/LOS_ANGELES     62.5
 2015-01-01 00:32:01 AMERICA/LOS_ANGELES     62.0
 2015-01-01 00:32:25 AMERICA/LOS_ANGELES     62.5
 2015-01-01 00:35:07 AMERICA/LOS_ANGELES     62.9
 2015-01-01 00:35:56 AMERICA/LOS_ANGELES     62.5
 2015-01-01 00:36:06 AMERICA/LOS_ANGELES     62.0
 2015-01-01 00:36:59 AMERICA/LOS_ANGELES     61.5
 2015-01-01 00:39:31 AMERICA/LOS_ANGELES     62.0
 2015-01-01 00:40:12 AMERICA/LOS_ANGELES     61.5
 2015-01-01 00:40:22 AMERICA/LOS_ANGELES     60.9
 2015-01-01 00:40:35 AMERICA/LOS_ANGELES     60.5
 2015-01-01 00:40:55 AMERICA/LOS_ANGELES     60.0
 2015-01-01 00:41:22 AMERICA/LOS_ANGELES     60.5
 2015-01-01 00:41:46 AMERICA/LOS_ANGELES     60.1
 2015-01-01 00:42:31 AMERICA/LOS_ANGELES     60.6

Answer 1

不完全确定它是否完全符合您的需要，但您可以在您的void Main() { var list = new CustomList<string>(); list.Add("Chicken"); list.Add("Bear"); list[1] = "Cow"; list[1].Dump(); //output Cow } public class CustomList<T> { IList<T> list = new List<T>(); public void Add(T item) { list.Add(item); } public T this[int index] { get { return list[index - 1]; } set { list[index - 1] = value; } } } CTE之后再添加两个查询，以包含您之前和之后的最后一条记录：

ALL_TIMES

第一个获得你的范围之前的最后一行的时间和价值;第二行在范围之后的第一行得到相同的结果。

从原来的（好的，略微调整的）查询我得到：

UNION ALL
SELECT
   MAX(H.TIME) KEEP (DENSE_RANK FIRST ORDER BY H.TIME DESC) AS TIME, 
   MAX(H.VALUE) KEEP (DENSE_RANK FIRST ORDER BY H.TIME DESC),
   1
FROM INPUTS I
INNER JOIN HST H
    ON H.TIME < I.START_TIME
UNION ALL
SELECT
   MIN(H.TIME) KEEP (DENSE_RANK FIRST ORDER BY H.TIME) AS TIME, 
   MIN(H.VALUE) KEEP (DENSE_RANK FIRST ORDER BY H.TIME),
   1
FROM INPUTS I
INNER JOIN HST H
    ON H.TIME > I.END_TIME

有了这些额外的工会，我得到了：

TIME                                          TWA TOTAL_DURATION
------------------------------------------ ------ --------------
01-JAN-15 00.10.00.000000000 EUROPE/LONDON   40.5             60
01-JAN-15 00.11.00.000000000 EUROPE/LONDON   62.1             60
...
01-JAN-15 00.29.00.000000000 EUROPE/LONDON   62.5             60
01-JAN-15 00.30.00.000000000 EUROPE/LONDON

由于TIME TWA TOTAL_DURATION ------------------------------------------ ------ -------------- 01-JAN-15 00.05.00.000000000 EUROPE/LONDON 60.8 245 01-JAN-15 00.10.00.000000000 EUROPE/LONDON 60.8 60 01-JAN-15 00.11.00.000000000 EUROPE/LONDON 62.1 60 ... 01-JAN-15 00.29.00.000000000 EUROPE/LONDON 62.5 60 01-JAN-15 00.30.00.000000000 EUROPE/LONDON 62.9 87 01-JAN-15 00.31.00.000000000 EUROPE/LONDON，我看到伦敦时代; CAST ( TRUNC ( TIME,'MI' ) AS TIMESTAMP WITH TIME ZONE )使其成为日期，显然没有时区信息; TRUNC然后将其转换为我的会话时区。（这就是为什么可能冗余的CAST对我来说也是一个问题）。如果你总是在目标TZ中运行它，那么它可能没关系，但是否则你需要做一些操作来保持理智的值。

在Oracle 11gR1中，我如何在时间戳条款

1 个答案: