title: ON clause in SQL join-does order matter?
body: <p>Are these two same?</p>
  
  <pre><code> - SELECT p.name,o.order_time FROM ORDERS o INNER JOIN PRODUCTS p on **o.product_id=p.id**;
   - SELECT p.name,o.order_time FROM ORDERS o INNER JOIN PRODUCTS p on **p.id=o.product_id**;
  </code></pre>
  
  <p>And are these two the same thing:</p>
  
  <pre><code> - SELECT p.name,o.order_time FROM ORDERS o LEFT JOIN PRODUCTS p on **o.product_id=p.id;**
   - SELECT p.name,o.order_time FROM ORDERS o LEFT JOIN PRODUCTS p on **p.id=o.product_id;**
  </code></pre>