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Asked: 2026-05-28T17:35:55+00:00

I work with SQL Server 2005. I have a table in which FK: two

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I work with SQL Server 2005. I have a table in which FK: two columns (book number, bookshelf number). A PK = FK + Datetime column. And also I have the column of value. I want to create query, which sort the data as follows.

I have this data set:

BookNumber   BookshelfNumber          DateTime          Value
    0              0             12.01.2012 14:40:42      4
    0              0             12.01.2012 14:45:42      5
    0              0             12.01.2012 14:48:42      9
    0              1             12.01.2012 14:38:42      1
    0              1             12.01.2012 14:42:42      4
    0              1             12.01.2012 14:48:42      1
    1              1             12.01.2012 14:38:42      5
    1              1             12.01.2012 14:48:42      7
    1              1             12.01.2012 14:58:42      4

After query I want this result:

BookNumber   BookshelfNumber          DateTime          Value
    0              0             12.01.2012 14:40:42      4
    0              1             12.01.2012 14:38:42      1
    1              1             12.01.2012 14:38:42      5
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1 Answer

  1. Editorial Team

    You can use the ROW_NUMBER function to add a number to your dataset that

    • restarts numbering by each change in Booknumber & BookshelfNumber (PARTITION BY)
    • Numbers the result from oldest to newest datetime (ORDER BY)

    SQL Statement

    SELECT  *
FROM    (
          SELECT  BookNumber
                  , BookShelfNumber
                  , DateTime
                  , Value
                  , rn = ROW_NUMBER() OVER (PARITION BY BookNumber, BookshelNumber ORDER BY DateTime)
          FROM    Books
        ) b
WHERE   rn = 1
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