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Help updating a record


Fishhead

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I am new to this forum and php.  I am constructing a website using Dreamweaver 8 that will allow commercial fishermen to keep tabs on the amount of quota they have remaining.  I have several tables within a database contained within mysql on my server.  When a fisherman logs in, he can see his starting quota.  When a fish buyer buys the fisherman's fish, he enters the record into a form that stores the catch data in a table within the database.

 

I wish to update the remaining quota table by subtracting the amount of fish that was caught and sold.  I am struggling to make this work.  Can anyone help with suggestion or direct me to reading matterial?

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