python - SQLAlchemy upsert -

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I would like to create tables from two existential tables in different sessions.

For example: 

  user {uid, fname, lname} salary {uid, pay} => Firstly I add the user to "newtables", and the salary is zero -> OK  
  n = NewTable (uid = 0, full_name = (user.fname + user.lname) ) Session.add (n) session.commit ()  
 
 ... commit, and do something else 
 
 and then I "merge" salaries in Newtb, The salary is ok, but the full_name has expired. 
 
  n2 = NewTable (UID = 0, pay = 100) Session.merge (n2) session.commit ()  
 
 Why? How can I increase only some areas? Or just automatically combine this way

After all, I got my solution. 

  Inserting from two tables  
  "Select and update" to avoid overwriting a new new object Session.add (doc) for the second table  
 
: 
 
  session.query (NewTable) .filter (NewTable.uid = = Doc.uid). Update (Doctor)

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