How to transfer data from a single row?

So I want to create a site for students for a certain university. I created 2 databases, both having identical fields (ID number, Name, Department, etc.). Database A contains all valid ID numbers for that university. Database B starts out empty. I want to create a process wherein if a student would type out his/her ID number on the live webpage and click submit, it would create a new entry for database B which includes ID number, Name, Department, and other fields I specified on Database A. Please help me.

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