title: SQL statement greater issue
body: <p>I'm building a small gym training system and I'm currently having a problem with an SQL query. I need to get the names of all customers who are more than ten kilos heavier than their target weight. Here are my tables.</p>
  
  <pre><code>Person: PersonID | Name | DOB | Email | Gender    
  Item: ItemID | Name | Portion | kCal | Fat    
  Training: TrainingID | Person_ID | StartDate | StartWeight | TargetWeight | CurrentWeight
  </code></pre>
  
  <p>Now I can get the list of people who are heavier than their target weight, but I specifically need to receive customers who are more than 10 kg heavier than their target weight. I know it's probably basic but I just couldn't get my head around it for somehow. Any help would be appreciated.</p>
  
  <p>Thank you</p>