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Convert a wide file to a long file?

Discussion in 'Information Technology' started by rocketD, Jul 28, 2006.

  1. rocketD

    rocketD
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    Guest

    Hi All,

    I have a table in my database that has, for each ID number, up to 4
    different types of Genus & species. For example, the fields are as
    such:

    ID Genus1 Species1 Genus2 Species2 Genus3 Species3
    etc...
    12 P. maniculatus M. sinomus
    13 P. eremicus

    I'd like to shift this table from wide to long, creating a many-to-many
    relationship between ID and Genus/Species and giving each different
    combo of ID and Genus/Species a unique ID (primary key), like so:

    uniqueID ID Genus Species
    1 12 P. maniculatus
    2 12 M. sinomus
    3 13 P. eremicus

    ....and so on.

    I know how to do this in SAS, but I don't have access to it right now.
    Does anyone have any suggestions on how to do this besides running a
    number of different append queries?

    Thanks,
    Dara
     
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  3. Dirk Goldgar

    Dirk Goldgar
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    Guest

    "rocketD" <darahx@gmail.com> wrote in message
    news:1151696540.255833.73410@y41g2000cwy.googlegroups.com
    > Hi All,
    >
    > I have a table in my database that has, for each ID number, up to 4
    > different types of Genus & species. For example, the fields are as
    > such:
    >
    > ID Genus1 Species1 Genus2 Species2 Genus3 Species3
    > etc...
    > 12 P. maniculatus M. sinomus
    > 13 P. eremicus
    >
    > I'd like to shift this table from wide to long, creating a
    > many-to-many relationship between ID and Genus/Species and giving
    > each different combo of ID and Genus/Species a unique ID (primary
    > key), like so:
    >
    > uniqueID ID Genus Species
    > 1 12 P. maniculatus
    > 2 12 M. sinomus
    > 3 13 P. eremicus
    >
    > ...and so on.
    >
    > I know how to do this in SAS, but I don't have access to it right now.
    > Does anyone have any suggestions on how to do this besides running a
    > number of different append queries?


    I would do it with 4 append queries -- setting that up would be faster
    than writing the code to do it with one pass through a recordset.

    --
    Dirk Goldgar, MS Access MVP
    www.datagnostics.com

    (please reply to the newsgroup)
     

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