title: In mysql, how to I query to see if a specific user is in a table?
body: <p>I have a table of users and I want a query that will tell me if a particular user is listed in the table.  For example, in the table below:</p>
  
  <p>Users | Ages<br>
  Bob | 22<br>
  Mike | 30<br>
  Sue | 21    </p>
  
  <p>Can someone help me with a query that does something like,<br>
  <code>If (In USERS_TABLE, Mike is in column 'Users'){$userPresent="true";}</code></p>