获取表中的第一条和最后一条记录

Question

我有不同 STime 和 ETime 的 Id1 和 Id2。对于每组 Id1 和 Id2，我倾向于获取第一条和最后一条记录（如输出所示）。 我尝试使用 Id1 和 Id2 对表进行分区，并使用以下命令按 asc 和 desc 顺序对其进行排序：

ROW_NUMBER() OVER(PARTITION BY B.HardwareId, A.TripId ORDER BY StartTime) AS first_record,
ROW_NUMBER() OVER(PARTITION BY B.HardwareId, A.TripId ORDER BY StopTime DESC) AS last_record

我没有得到预期的结果。

SELECT
    A.Id1 AS Id1,
    A.Id2 AS TriId2pId,
    STime,
    ETime,
    Latitude,
    Longitude

FROM
    Tr.T1 AS A
JOIN
    Tp.G2 AS B
ON
    A.STime < B.DateTime
    AND A.ETime >= B.DateTime
    AND A.Id1 = B.Id1
WHERE
  (A._PARTITIONTIME BETWEEN TIMESTAMP('2016-11-23')
    AND TIMESTAMP('2016-11-23')
    AND A.Id1 IN (976))
ORDER BY
   B.Id1,
   A.Id2,
   B.DateTime 



    Id1 Id2 STime               ETime               Latitude    Longitude
    976 715 2016-11-23 13:06:26 2016-11-23 13:23:30 26.2230015  -80.12314    
    976 715 2016-11-23 13:06:26 2016-11-23 13:23:30 26.2229767  -80.12326    
    976 715 2016-11-23 13:06:26 2016-11-23 13:23:30 26.2226944  -80.12344
    976 800 2016-11-23 13:06:26 2016-11-23 13:24:59 26.2251511  -80.11865    
    976 800 2016-11-23 13:06:26 2016-11-23 13:24:59 26.2251511  -80.11912    
    976 800 2016-11-23 13:06:26 2016-11-23 13:24:59 26.2250233  -80.11929    
    976 800 2016-11-23 13:06:26 2016-11-23 13:24:59 26.2245369  -80.11929        


    Id1 Id2 STime               ETime               Latitude    Longitude
    976 715 2016-11-23 13:06:26 2016-11-23 13:23:30 26.2230015  -80.12314
    976 715 2016-11-23 13:06:26 2016-11-23 13:23:30 26.2226944  -80.12344
    976 800 2016-11-23 13:06:26 2016-11-23 13:24:59 26.2251511  -80.11865
    976 800 2016-11-23 13:06:26 2016-11-23 13:24:59 26.2245369  -80.11929   

Answer 1

您最初问题中的查询与您以后的 cmets 不完全匹配，但下面仍应帮助您实现目标

试试

SELECT
   A.Id AS Id,
   StartTime,
   StopTime,
   Latitude,
   Longitude
FROM (
  SELECT
   A.Id AS Id,
   StartTime,
   StopTime,
   Latitude,
   Longitude,
   ROW_NUMBER() OVER(PARTITION BY id ORDER BY StartTime) AS first_record,
   ROW_NUMBER() OVER(PARTITION BY id ORDER BY StartTime DESC) AS last_record
  FROM
   Tb1.Ids  AS A
  JOIN
   Tb2.Points AS B
  ON
   A.StartTime <= B.DateTime
   AND A.StopTime >= B.DateTime
   AND A.HardwareId = B.HardwareId
  WHERE
   (A._PARTITIONTIME BETWEEN TIMESTAMP('2016-11-23')
    AND TIMESTAMP('2016-11-23'))
   AND A.Id IN (334)
)
WHERE first_record = 1 OR last_record = 1  

这里的想法是在内部查询中添加两个字段，从开始和结束对所有行进行编号

   ROW_NUMBER() OVER(PARTITION BY id ORDER BY StartTime ) AS first_record,
   ROW_NUMBER() OVER(PARTITION BY id ORDER BY StartTime DESC) AS last_record

and than 分别保留第一行和最后一行

WHERE first_record = 1 OR last_record = 1