title: Referencing the foreign key of another schema
body: <p>For my project I am using oracle database where I have to work with 2 different database schema. Consider the following scenario please - </p>
  
  <p>I have a schema <code>A</code> and in it I have a table <code>table_a</code> with a primary key <code>apk</code>  </p>
  
  <p>And I have another schema <code>B</code> and in it I have a table <code>table_b</code> with a primary key <code>bpk</code>  </p>
  
  <p>If both of these tables are in a same database then I can easily make a primary key - foreign key relationship.  </p>
  
  <p>But can I make a primary key - foreign key relation ship (or something like this) between these two columns - <code>A.table_a.apk</code> and <code>B.table_b.pbk</code>.   </p>
  
  <p>Thanks in advance.  </p>