SQL question ( retrieving records based on a priority order )

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  • myemail.an@googlemail.com

    SQL question ( retrieving records based on a priority order )

    Hi all,

    I have a table with this structure:

    Customer ID | Transaction date | Transaction type
    1 | 1/2/2008 | F
    1 | 1/4/2007 | M
    1 | 1/2/2008 | R
    2 | 1//5/2007 | M
    2 | 1/6/2007 | R


    For each customer ID, I need to retrive only the records with the most
    recent transaction date, and I did:

    Customer ID | Transaction date | Transaction type
    1 | 1/2/2008 | F
    1 | 1/2/2008 | R
    2 | 1/6/2007 | R

    The problem is, each customer can make more than one transaction in
    the same day (see above). In these cases, I need to retrieve only one
    record per customer, based on the importance of the transaction: F is
    more "important" than R which is more "important" than M. So, in the
    example above, I would only retrieve transaction F for customer 1 and
    disregard transaction R: they were made on the same date, but I am
    more interested in F than in R.

    Do you have any suggestions on how I could achieve this in SQL?

    I use Microsoft SQL server 2005.

    Thank you for your help!
  • myemail.an@googlemail.com

    #2
    Re: SQL question ( retrieving records based on a priority order )

    Thank you all for your precious tips!

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