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  1. #1
    Junior Member
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    Oct 2014
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    Automatic updates with cascading?

    Hello! I'm very new to SQL development and I've trying to make something like a social networking site. I plan to use cascading updates to a foreign key to link a user ID from one table (my main users table) to a table full of posts. I don't even know for sure that this is the best way to achieve what I'm trying to accomplish, but assuming it is, I want it set up so that if a new user joins the site, it auto increments a row in the ID column on the user table as well as in any table where that ID is a primary key.

    The trouble I'm having is that it doesn't make a new row. Right now I have two fake users registered for testing purposes in the user table and they have IDs 1 and 2, respectively. But adding them did nothing to the user ID foreign key in my posts table. I'm assuming it's not supposed to, but if it's not, what's the point of setting a foreign key?

    EDIT: I figured out another method of doing what I'm trying to do. I don't know if there's a way I can delete this thread since no one had replied but either way, I'm good now. Thanks!
    Last edited by Sam_Sung; Oct 17th, 2014 at 09:36 PM.


  3. #2
    Senior Member Ronald Roe's Avatar
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    Mar 2011
    Oklahoma City
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    959 times
    If you could post how you fixed it, we could leave the thread up for future users who have the same problem.
    Ron Roe
    Web Developer
    "If every app were designed using the same design template, oh wait...Bootstrap."

  4. #3
    Unpaid WDF Intern TheGAME1264's Avatar
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    Dec 2002
    Not from USA
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    2784 times
    A foreign key is intended to identify the "one" in a "one-to-one" or "one-to-many" relationship. For example, an orders table could contain a Customer_ID foreign key that would tie to a customers table, since one customer could place anywhere from 0 orders upwards. As such, your Customer_ID would only be a primary key on the customers table, not the orders table. Primary key = unique identifier. Hopefully that clears it up for you.

    Other than that, what Ron said...if you can do so without compromising your project.
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