title: MySQL Select: Find if a single value exists in an array field
body: <p>I've a field "locations" containing values in format 1,4,7,8 etc. </p>
  
  <p>I want to exclude rows that contain a specific value. eg: <code>$location = 4;</code></p>
  
  <p>I tried: <code>SELECT * FROM users WHERE FIND_IN_SET($location, locations) = 0</code></p>
  
  <p>Also tried some combinations with IN .. !IN but again no results. Any suggestion?</p>
  
  <p>Thank you</p>