title: How to import \ update data from column from one table to column from another table by comparing their ids
body: <p>I have 2 tables.</p>
  
  <p>1 Table have 2 columns <code>key</code> and <code>id2</code> (not primary).
  2 Table have 2 columns <code>key</code> and <code>id2</code> (not primary)  and so on information in row that cant be ignored. </p>
  
  <p>How can i import or update <code>key</code> from 1st table using smth like : "if 1st table id2= 2nd table id2 then import 1st <code>key</code> to <code>key</code>? I simply dont understand.... </p>