title: Is there any difference between left join and just displaying the entire left table
body: <p>I am new to SQL and am trying to understand left join.</p>
  <p><a href="https://i.stack.imgur.com/xIXWk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xIXWk.png" alt="enter image description here" /></a></p>
  <p>This is the diagram that I keep coming across when I search for left join. But what I fail to understand is the difference between left join and actually just selecting the whole left table, since they seem to be pretty much the same. After all, the highlighted area is just the entirety of the left table and nothing else.</p>
  <p>I have tried looking for this answer, but all I keeping coming across are differences between inner and outer joins but not the answer to this particular question.</p>
  <p>Thanks in advance for helping me out!</p>