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Asked: 2026-05-10T15:12:06+00:00

I have a History Table in SQL Server that basically tracks an item through

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I have a History Table in SQL Server that basically tracks an item through a process. The item has some fixed fields that don’t change throughout the process, but has a few other fields including status and Id which increment as the steps of the process increase.

Basically I want to retrieve the last step for each item given a Batch Reference. So if I do a 

Select * from HistoryTable where BatchRef = @BatchRef

It will return all the steps for all the items in the batch – eg

 Id      Status  BatchRef        ItemCount 1       1       Batch001        100 1       2       Batch001        110 2       1       Batch001        60 2       2       Batch001        100

But what I really want is:

 Id      Status  BatchRef        ItemCount 1       2       Batch001        110 2       2       Batch001        100

Edit: Appologies – can’t seem to get the TABLE tags to work with Markdown – followed the help to the letter, and looks fine in the preview

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1 Answer

  1. It’s kind of hard to make sense of your table design – I think SO ate your delimiters.

    The basic way of handling this is to GROUP BY your fixed fields, and select a MAX (or MIN) for some unqiue value (a datetime usually works well). In your case, I think that the GROUP BY would be BatchRef and ItemCount, and Id will be your unique column.

    Then, join back to the table to get all columns. Something like:

    SELECT *  FROM HistoryTable JOIN (    SELECT         MAX(Id) as Id.        BatchRef,        ItemCount    FROM HsitoryTable    WHERE        BacthRef = @batchRef    GROUP BY        BatchRef,        ItemCount  ) as Latest ON    HistoryTable.Id = Latest.Id
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