title: How to add non related table to othe related tables
body: <p>I have three tables users, user_bio and books</p>
  
  <pre><code>user_tb
  id | name  
  -------------
   1 | Dan
   2 | Mick
   3 | Jane
  
  user_bio
  id | uid | bio
  -------------
   1 | 2   | Micks bio
   2 | 3   | Janes bio
   3 | 1   | Dans bio
  
  boos_tb
  id | name
  -----------------
   1 | Maths
   2 | Science
   3 | English
   4 | French
   5 | Social Studies
  </code></pre>
  
  <p>I know I can select the users_tb and user_bio table by using JOIN statement, but my problem is how to add the book table to query when it does not relate to any of the previous tables.  </p>
  
  <p>The result i am expecting is like this</p>
  
  <pre><code>uid  | name |     bio     | bookid | bookname
  ------------------------------------------- 
   2   | Mick |  Micks bio  |    1   | Maths
   3   | Jane |  Janes bio  |    2   | Science
   1   | Dan  |  Dans bio   |    3   | English
  null | null |    null     |    4   | French
  null | null |    null     |    5   | Social Studies
  </code></pre>
  
  <p>I will be glad if anyone can be of help, thank you.</p>