title: er diagram showing relations between attributes
body: <p>I'm looking for <strong>free</strong> tool for generating ER diagram. I now there are a lot of stuff I can find them in google, but I need something specific and can't it find. </p>
  
  <p>The tool should generate ER diagrams showing relations between attributes like in below image. Note that this diagram shows phisical relation <strong>table1.attributeX &lt;----> table2.attributeY</strong></p>
  
  <p><img src="https://i.stack.imgur.com/6XjK4.png" alt=""></p>
  
  <p><strong>Note: I am not asking for tools that generate diagrams like these. This diagrams doesn't explicit show relations between attrobutes.</strong></p>
  
  <p><a href="https://i.stack.imgur.com/GLCRJ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GLCRJ.jpg" alt=""></a><br>
  <sub>(source: <a href="http://www.philblock.info/hitkb/_images/erd-example2.jpg" rel="nofollow noreferrer">philblock.info</a>)</sub>  </p>