title: Link two tables in SQL
body: <p>I have this two following table :</p>
  <pre><code>|**Machines**|    |**Parts**|
  |idMachine   |    |idPart   |
  |label       |    |label    |
  </code></pre>
  <p>I would like to link this two tables knowing that one machine can have multiple parts and one part can composed multiple machines.</p>
  <p>At the end, It will be use in a web form: when a user choose a machine, I display the different parts linked to the chosen machine.</p>
  <p>Do I have to create another table to link this two tables or I can simply write a SQL request ? Or any other solutions?</p>