title: Fill in missing values in a SELECT statement
body: <p>I have a table with two columns, customer id and order.
  Let's say I have in total order IDs 1,2,3,4</p>
  
  <p>All the customer can have all the four orders, like below:</p>
  
  <pre><code>    1234 1
      1234 2
      1234 3
      1234 4
      3245 3
      3245 4
      5436 2
      5436 4
  </code></pre>
  
  <p>You can see above that 3245 customer doesn't have order id 1 or 2.
  How could I print in the query output like:</p>
  
  <pre><code>3245 1
  3245 2
  5436 1
  5436 3
  </code></pre>
  
  <p><strong>EDIT: I don't have an order table, but I have a list of order's like we can hard code it in the query(1,2,3,4).</strong></p>