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Asked: 2026-06-11T14:06:15+00:00

I have a table I need to copy my data from (Log), into another

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I have a table I need to copy my data from (Log), into another table (BigTable). The Log table got the following data:

   LogID   LogTime             JobNumber    LogType   Description
   =====   =======             =========    =======   ===========
   1       2012-09-01 00:00:01   1          100       Accepted by D#12
   2       2012-09-01 00:05:33   1          100       Accepted by D#14
   3       2012-09-01 01:00:14   2          107       Message sent
   4       2012-09-01 05:00:53   2          100       Accepted by D#78
   5       2012-09-01 05:01:55   1          110       POB at Stop 1
   6       2012-09-01 05:02:22   3          100       Accepted by D#98
   7       2012-09-01 05:03:00   1          110       POB at Stop 2
   8       2012-09-01 05:04:00   2          110       POB at Stop 1
   9       2012-09-01 05:05:25   3          110       POB at Stop 1
  10       2012-09-01 05:15:36   1          200       Completed
  11       2012-09-01 05:20:45   2          200       Completed

The following data is already in BigTable

   JobNumber     Accepted_At     POB_At       Completed
   =========     ===========     ======       =========
    1            NULL            NULL         NULL
    2            NULL            NULL         NULL
    3            NULL            NULL         NULL

I am trying to update BigTable with values from Log. Note that in case of duplicate entries like LogID 1 and 2 (above), I am picking up only the latest date (2012-09-01 00:05:33). The same is desired for POB, as we are only interested in “POB at Stop 1”.

There are millions of rows in Log for lots of Job numbers, however, I need to get time for only those Jobs which are in BigTable only.
The Ideal table (after all updates) will look like the following: 

   JobNumber   Accepted_At            POB_At                  Completed
   =========   ===========            ======                  =========
    1          2012-09-01 00:05:33    2012-09-01 05:01:55     2012-09-01 05:15:36
    2          2012-09-01 05:00:53    2012-09-01 05:04:00     2012-09-01 05:20:45
    3          2012-09-01 05:02:22    2012-09-01 05:05:25     NULL

Please note I am novice in this field. Any help is appreciated.
Thanks in advance.
Regards

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1 Answer

  1. Editorial Team

    You could aggregate the MAX dates in a CTE and then join it to BigTable for the update:

    ; WITH CTE AS (
    SELECT
    g.JobNumber
    , Accepted_At = MAX(CASE WHEN LogType = 100 THEN LogTime END)
    , POB_At = MAX(CASE WHEN LogType = 110 AND [Description] LIKE '%Stop%1' THEN LogTime END)
    , Completed = MAX(CASE WHEN LogType = 200 THEN LogTime END)
    FROM [Log] g
    GROUP BY g.JobNumber, g.LogType
)
UPDATE b
SET Accepted_At = CTE.Accepted_At
, POB_At = CTE.POB_At
, Completed = CTE.Completed
FROM CTE
JOIN BigTable b ON b.JobNumber = CTE.JobNumber
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