title: update from another table with 2 primary keys
body: <p>i have two table T1 &amp; T2 with same columns (service, desti,...)
  composite primary key on T1 (service, desti)
  I want to update t1 as data  in t2.</p>
  
  <p>Plz advise,</p>
  
  <p>Thanks in advance</p>