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  1. #1
    technesurge is offline Novice
    Windows 7 64bit Access 2010 64bit
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    May 2012
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    How do you select a field based on user input?

    I have many fields of data in a table. I want the user to type in the name of the field and use that in a query.



    For example, the table looks like this:

    DateAndTime, Field1, Field2, Field3, ... FieldX
    --------------------------------------------------
    6/20/2012 2:00PM, 14, 6, 45...
    6/20/2012 2:00PM, 8, 5, 13...
    6/20/2012 2:00PM, 53, 25, 62...

    If the user types in "Field1" (through a form or parameter)
    Then the query would select Field1:

    14
    8
    53


    I tried using a parameter in the SELECT statement and that did not work... any suggestions?

  2. #2
    pbaldy's Avatar
    pbaldy is offline Who is John Galt?
    Windows XP Access 2007
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    Feb 2010
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    21,883
    I'm curious what the fields contain, as I suspect a normalization issue. In any case, the only way to do what you describe would be to build the SQL in VBA code. I don't know of any way to dynamically select the fields in a query (because in a normalized database you wouldn't need to).
    Paul (wino moderator)
    MS Access MVP 2007-2019
    www.BaldyWeb.com

  3. #3
    technesurge is offline Novice
    Windows 7 64bit Access 2010 64bit
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    Each field is a temperature transmitter.Each record occurs once per second. Somehow I need to create a way for the user to choose Transmitter X and then I will graph that data. I'm trying to avoid making a graph for each transmitter because there are many.

  4. #4
    pbaldy's Avatar
    pbaldy is offline Who is John Galt?
    Windows XP Access 2007
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    The normalized design would be

    Code:
    DateTime             TransmitterID   Reading
    6/20/2012 2:00PM         1             14
    6/20/2012 2:00PM         2              6
    Then your query is simple; the user chooses the transmitterID and perhaps a date/time range.
    Paul (wino moderator)
    MS Access MVP 2007-2019
    www.BaldyWeb.com

  5. #5
    technesurge is offline Novice
    Windows 7 64bit Access 2010 64bit
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    Ok, I understand what you mean about renormalizing the data. I've been trying to put the data in the format you have prescribed with no success. Perhaps you could point in the right direction, thank you.

  6. #6
    pbaldy's Avatar
    pbaldy is offline Who is John Galt?
    Windows XP Access 2007
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    Perhaps if I knew exactly what you were trying and exactly what goes wrong. You can use a UNION query or a series of append queries to get the data from your original table to a normalized table.
    Paul (wino moderator)
    MS Access MVP 2007-2019
    www.BaldyWeb.com

Please reply to this thread with any new information or opinions.

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