title: mysql if not exist
body: <p>I am coming from MSSQL, and now using Mysql, this may be a easy one but how do you execute a 
  if not exist statement. thanks</p>
  
  <pre><code>IF NOT EXISTS(SELECT * from users WHERE Username = spUsername)
      BEGIN
      INSERT into users(ID,Username,Password,Email,Birthdate,DateJoin)
              VALUES(UUID(),spUsername,spPassword,spEmail,spBirthDate,NOW());
      END
  </code></pre>