title: Select in MySQL where all rows meet a condition
body: <p>In MySQL, how can you select data where every row meets a certain condition? For example lets say I have a table showing when employees arrived at work, it has three fields: </p>
  
  <pre><code>CREATE TABLE ArrivalTimes
  (UserID INT
  ,Day DATE 
  ,ArrivalTime TIME
  );
  </code></pre>
  
  <p>I want to select all UserIDs of employees who have never been late (arrived 9am or earlier), what's the best way to do this?</p>