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  1. #1
    Ant_Snell is offline Advanced Beginner
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    Multivalued Combo Alternative


    I have a DB with a few multivalued combo boxes. E.g. Select Days you are available: with a combo listing Mon,Tue,Wed etc. and you can select Mon & Wed.
    I am intending to convert the backend to My SQL and understand that Multivalued are not supported. How can I convert my Multivalued fields into normalised table structure that will have the same look and functionality of the built in Access Multivalued combo box?

  2. #2
    orange's Avatar
    orange is offline Moderator
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    I recommend you post a copy of the database - remove anything confidential - include instructions to get to the issue you're are describing. You can alter your table structure to remove the need for MVF fields. But you are talking in the abstract, and readers need something concrete in order to provide more focused responses.
    You may find something in the Similar Threads at bottom of the page.

  3. #3
    Ant_Snell is offline Advanced Beginner
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    My DB has over 300 objects so would be a bit difficult to anomalies so I have created an example.
    MyForm shows a combo box with values from a MVF. I need to create something with the same functionality as this but that will be supported in MySQL. I believe I need to create a link table with maybe a Y/N field type, but I am struggling
    CheersClick image for larger version. 

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  4. #4
    orange's Avatar
    orange is offline Moderator
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    Based on your example, a consideration for table structure would be

    Person --->PersonFavColor<---Color

    Where
    Person table has fields
    PersonID.....PK
    PersonName...

    Color has fields
    ColorID.......PK
    ColorName..

    and PersonFavColor (junction table) has fields

    PersonID
    ColorID

    You would use a multiSelect listbox to display the colors
    The selected favorites and the current PersonID would be used to populate table PersonFavColor.

    Any relational database should support the table structure shown above.

    You can search youtube with "ms access multiselect listbox" to get video tutorials.

  5. #5
    June7's Avatar
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    Also, using a multi-select listbox would require code to loop the selected items and save a record for each.
    How to attach file: http://www.accessforums.net/showthread.php?t=70301 To provide db: copy, remove confidential data, run compact & repair, zip w/Windows Compression.

  6. #6
    Ant_Snell is offline Advanced Beginner
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    Thanks both but was hoping for a bit more detail; What would table/query would the combo box be based on?, what table would the Y/N check box be in?, how can I add an OK,Cancel and possibly a Select all button to a combo box? If I need code to do any of this, what is it and were would it go? Sorry but only a beginner. Thanks

  7. #7
    orange's Avatar
    orange is offline Moderator
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    We are advising that for multi select you should use the Listbox control not combobox.

    Here is a youtube describing multiselect listbox by evil programmer

    It may facilitate communications if you could post a copy of your database or a custom copy that focuses on the issue you are trying to resolve.

    It seems you are describing a part of a larger issue in abstract terms. More details please.

  8. #8
    June7's Avatar
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    If you want checkboxes and a list that looks like a multi-select combobox, that would require an unbound form and lots of code to write data to table. This would be fine if your list is not long, say no more than the 6 colors as shown in your example.
    How to attach file: http://www.accessforums.net/showthread.php?t=70301 To provide db: copy, remove confidential data, run compact & repair, zip w/Windows Compression.

  9. #9
    ssanfu is offline Master of Nothing
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    You should read very carefully this link ->> Multivalued Fields - BAD
    Last edited by ssanfu; 06-22-2022 at 01:26 PM. Reason: updated link URL
    HTH
    -----
    Steve
    --------------------------------
    "Veni, Vidi, Velcro"
    (I came; I saw; I stuck around.)

  10. #10
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    isladogs is offline Very idle programmer
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    Sorry Steve but links to my old site no longer work reliably.
    This is the updated link https://www.isladogs.co.uk/multivalu...lds/index.html
    Colin (Mendip Data Systems): Website, email
    Try again. Fail again. Fail better.
    A
    sking for help isn't giving up. Its refusing to give up.

  11. #11
    ssanfu is offline Master of Nothing
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    Thanks for the update Colin. I have updated my reference file to the new link.
    (and updated the link URL in Post #9)
    HTH
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    Steve
    --------------------------------
    "Veni, Vidi, Velcro"
    (I came; I saw; I stuck around.)

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