Modify data in 1 table using data from another table

So I’m working on an app to help organize and quickly fill out forms and update information on the go from mobile device. So far, I love this app! However, I’m stuck doing the following.

I have a table for:

  1. Equipment (laptops, speakers etc.) Saves data related to the equipment and who owns it currently USER_ID.

  2. Assignment Forms (A form to fill out when equipment changes ownership) Has unique FORM_ID, USER_ID (max. 1) and date, and a virtual table that contains all equipment that will be assigned on this form.

  3. Assignment registries (Created by adding equipment to assignment form) Saves FORM_ID of the Assignment form it belongs to, the id of the equipment it will modify and the reason of the ownership change.

So what I need to do now is create an action(s) triggered by a button, that will update the USER_ID in equipment table using the USER_ID from the Assignment form, and do this for every registry with the same FORM_ID where I clicked the button.

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