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Asked: 2026-06-12T16:04:17+00:00

I have a table that holds allocations of problem reports (PRs) as follows: TABLE

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I have a table that holds allocations of problem reports (PRs) as follows:

TABLE "ALLOCATIONS"

ALLOCATIONID    PRID    DATEALLOCATED        ENG_ID
1               401     20-SEP-06 10.48.00   1
2               401     20-SEP-06 10.48.00   2
3               401     20-SEP-06 10.48.00   2
4               402     20-SEP-06 12.35.00   1
5               402     20-SEP-06 12.43.00   1
6               402     20-SEP-06 13.43.00   2
7               700     14-OCT-12 13.30.05   1
8               700     14-OCT-12 13.30.35   2
9               700     14-OCT-12 14.30.35   2

The most recent allocation determines which engineer the PR is now assigned to. I want to find all the PRs that are assigned to engineer 2 for example.
So I look for the most recent allocation for each PRID, check the ENG_ID, then pull out the information from this table if the ENG_ID is correct.

This table contains the actual PR descriptions (and other info omitted here for clarity).

TABLE "PROBLEMS"

PRID     TITLE
401      Something
402      Something
700      Something

To do this I have used the DATEALLOCATED field as follows:

SELECT PRID, TITLE FROM PROBLEMS p WHERE p.PRID IN
(
    SELECT GROUPEDALLOC.PRID FROM allocations alloc INNER JOIN
    ( 
        SELECT PRID, MAX(DATEALLOCATED) AS MaxAllocationDate    
        FROM allocations   
        GROUP BY PRID
    ) 
    groupedAlloc ON alloc.PRID = groupedAlloc.PRID 
    AND ALLOC.DATEALLOCATED = groupedAlloc.MaxAllocationDate 
    AND ENG_ID = 2
) 
ORDER BY PRID DESC;

Now this works fine for records 7,8,9 above which were inserted with a long date format that includes the seconds, however for the older records which didn’t log the seconds this will obviously not work. For these records I want to fall back on the allocationID (which may or may not be sequential obviously – however it is a last resort and better than nothing).

My question is, how do I modify my query to perform this extra condition on the DATEALLOCATED (i just want to see if they are all equal for a particular PRID), and then use the ALLOCATIONID instead?

I am using OracleXE but I want to stick to standard SQL if possible.

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1 Answer

  1. Editorial Team

    Does this do it for you ?

    WITH 
  BY_DATE
  AS (SELECT PRID, MAX (DATEALLOCATED) AS MAXDATE FROM ALLOCATIONS GROUP BY PRID),

  BY_ALLOC
  AS (SELECT A.PRID, MAXDATE, MAX (ALLOCATIONID) AS MAXALLOC
        FROM ALLOCATIONS A JOIN BY_DATE B ON 
             A.PRID = B.PRID AND 
             A.DATEALLOCATED = B.MAXDATE
      GROUP BY A.PRID, MAXDATE)

SELECT A.PRID, A.ENG_ID
  FROM ALLOCATIONS A JOIN BY_ALLOC B ON 
       A.ALLOCATIONID = B.MAXALLOC;
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