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The Alpha Software Forum Participation Guidelines

The Alpha Software Forum is a free forum created for Alpha Software Developer Community to ask for help, exchange ideas, and share solutions. Alpha Software strives to create an environment where all members of the community can feel safe to participate. In order to ensure the Alpha Software Forum is a place where all feel welcome, forum participants are expected to behave as follows:
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Be sure all comments and threads you post are respectful. Posts that contain any of the following content will be considered a violation of your agreement as a member of the Alpha Software Forum Community and will be moderated:
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If a thread or post is found to contain any of the content outlined above, a moderator may choose to take one of the following actions:
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Moderators may also rename posts and threads if they are too generic or do not property reflect the content.

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Community members are encouraged to click the "Report Post" icon in the lower left of a given post if they feel the post is in violation of the rules. This will alert the Moderators to take a look.

Alpha Software Corporation may amend the guidelines from time to time and may also vary the procedures it sets out where appropriate in a particular case. Your agreement to comply with the guidelines will be deemed agreement to any changes to it.



Bonus TIPS for Successful Posting

Try a Search First
It is highly recommended that a Search be done on your topic before posting, as many questions have been answered in prior posts. As with any search engine, the shorter the search term, the more "hits" will be returned, but the more specific the search term is, the greater the relevance of those "hits". Searching for "table" might well return every message on the board while "tablesum" would greatly restrict the number of messages returned.

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The more detail you provide about your problem or question, the more likely someone is to understand your request and be able to help. A sample database with a minimum of records (and its support files, zipped together) will make it much easier to diagnose issues with your application. Screen shots of error messages are especially helpful.

When explaining how to reproduce your problem, please be as detailed as possible. Describe every step, click-by-click and keypress-by-keypress. Otherwise when others try to duplicate your problem, they may do something slightly different and end up with different results.

A note about attachments
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Similarly, if you are uploading a zipped archive, you should simply create a .ZIP file and not a self-extracting .EXE as many users will not run your EXE file.
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Select... from .... where.....

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    #1

    Select... from .... where.....

    Firstly, apologies for the obscure thread title. I could not think how else to describe my query in one line :o

    I think a great deal of my problems stem from being fairly proficient in php/MySQL. I am finding the transition somewhat difficult as I keep lapsing into php all the time.

    I have two tables - Activities and Donations

    There can be several records in the Donations table linked to a single Activities record.

    Records in the Donations table contain a field Amount.
    Records in the Activities table contain a field Total_donation.

    I think you can probably see where this is going, can't you? :D

    When a record is added, modified, or deleted from the Donations table I want to update the Total_donation value in the Activities table.

    On saving the changes, I want to select all records from the donations table where the ActivityID (linking field) matches the current record, and then add the values in the amount field of all these records so I can write the result to the Total_Donation field.

    Any help would be much appreciated.

    (Who's going to get there first? Stan or Mike? :D)
    If computers are so clever how come someone as dumb as me has to tell them what to do?
    Tags: None
    #2
    Re: Select... from .... where.....

    Instead of using your logic, how about using the function DBSUM(). This will look up the values and sum them together for you.

    Comment

      #3
      Re: Select... from .... where.....

      Make total donations a calculated field with the expression

      tablesum("Donations","linkingfieldindonations = "+quote(linkingfieldinactivities),"amount)

      That's one way but it requires recalculating the calc fields whenever you want updated totals.

      Another way is to have a posting field rule from activities to donations.
      There can be only one.

      Comment

        #4
        Re: Select... from .... where.....

        Thanks for your help guys.

        I must stop making stuff more complicated than it really is :o

        I had thought about Posting Field Rules, but I thought this would cause a problem if the user changed an existing record - e.g. incorrectly entered 50 instead of 500, saved the record, then went back and edited it. But no. Alpha 5 is clever enough to sort this out.

        Stan; I think you should change your user name to "Fridge"......... you've saved my bacon once again :D
        If computers are so clever how come someone as dumb as me has to tell them what to do?

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