SQL pure to partition the occurrences of DateTime in windows without overlap?

I have a question who, until now, I never was able to solve with a pure SQL option.

It is difficult to explain in words, but it's something like this:
given a set date and time, I would like to partition the data into windows without overlap of 30 minutes each.

the data is supposed to be partitioned in the windows of 30 minutes, which means when the data are within 30 minutes of the first, only the first occurrence is returned. in the next second after the 30th minute, the record will be considered the beginning of a new window and is also returned. If data that occurs during the latency period is deleted. the first occurrence does not necessarily occur on the 00eme minute, so the beginning of the window is never constant.


Run the query to look the dummy data below.
SELECT     'A' AS ID
          , TRUNC(SYSDATE) + 7 / 24 + 1 *(ROWNUM - 1) / 1440 AS datetime
      FROM DUAL
CONNECT BY ROWNUM <= 50
UNION ALL
SELECT     'A' AS ID
          , TRUNC(SYSDATE) + 9 / 24 + 8 / 1440 + 1 *(ROWNUM - 1) / 1440 AS datetime
      FROM DUAL
CONNECT BY ROWNUM <= 35
UNION ALL
SELECT     'B' AS ID
          , TRUNC(SYSDATE) + 7 / 24 + 5 *(ROWNUM - 1) / 1440 AS datetime
      FROM DUAL
CONNECT BY ROWNUM <= 15
This is supposed to be the output.
ID     DATETIME
A     5/19/2010 07:00:00
A     5/19/2010 07:30:00
A     5/19/2010 09:08:00
A     5/19/2010 09:38:00
B     5/19/2010 07:00:00
B     5/19/2010 07:30:00
B     5/19/2010 08:00:00
so far, I use a PL/SQL for channel registrations. but I would like to know if this goal is achievable through SQL or not.

I tried to look at analytics, width_bucket, options ntile and alll I can think, but I just can't solve this problem at all.

This gives the expected results. I hope that someone can improve it...

WITH T AS (
SELECT 'A' AS ID
      , TRUNC(SYSDATE) +(6.75 / 24) AS datetime
  FROM DUAL
UNION ALL
SELECT     'A' AS ID
          , TRUNC(SYSDATE) + 7 / 24 + 1 *(ROWNUM - 1) / 1440 AS datetime
      FROM DUAL
CONNECT BY ROWNUM <= 50
UNION ALL
SELECT     'A' AS ID
          , TRUNC(SYSDATE) + 9 / 24 + 8 / 1440 + 1 *(ROWNUM - 1) / 1440 AS datetime
      FROM DUAL
CONNECT BY ROWNUM <= 35
UNION ALL
SELECT     'B' AS ID
          , TRUNC(SYSDATE) + 7 / 24 + 5 *(ROWNUM - 1) / 1440 AS datetime
      FROM DUAL
CONNECT BY ROWNUM <= 15
)
SELECT ID, DATETIME
FROM (
  SELECT A.ID, A.DATETIME, A.PREVTIME, B.NEXTTIME
  FROM (
    SELECT ID, DATETIME
         , LAG(DATETIME) OVER (PARTITION BY ID ORDER BY DATETIME) AS PREVTIME
         , LAST_VALUE(DATETIME)
             OVER (PARTITION BY ID ORDER BY DATETIME
             RANGE BETWEEN CURRENT ROW
               AND NUMTODSINTERVAL(29, 'MINUTE') FOLLOWING)
           AS INTERVAL_END
    FROM T
  ) A
  ,(
    SELECT ID, DATETIME
         , LEAD(DATETIME) OVER (PARTITION BY ID ORDER BY DATETIME) AS NEXTTIME
    FROM T
  ) B
WHERE B.ID=A.ID
AND B.DATETIME=A.INTERVAL_END
)
START WITH PREVTIME IS NULL
CONNECT BY ID=PRIOR ID
      AND DATETIME=PRIOR NEXTTIME
ORDER BY ID, DATETIME
;

Kind regards
Bob

Tags: Database

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