title: About an sql query
body: <p>I have a problem with SQL, i explain me :</p>
  <p>I have 2 tables</p>
  <blockquote>
  <p>announcements_job</p>
  <p>announcements_education</p>
  </blockquote>
  <p>Below you can see a preview of tables</p>
  <p><strong>announcements_education</strong>
  <img src="https://i.stack.imgur.com/mTr4S.png" alt="announcements_education" /></p>
  <p><strong>announcements_job</strong>
  <img src="https://i.stack.imgur.com/LjUWW.png" alt="announcements_job" /></p>
  <p>I think my database structure is not very good ... but it's to late ! (forget my Datatype, it's bullshit actually), am i a bad man ?</p>
  <p>So : How can you take last 5 records ORDER BY insert_db_date (between this two tables) ?</p>
  <p>-&gt; If it's not possible, do you have another solution?</p>
  <p>Thanks in advance ;)</p>