title: What can not be done / which results are impossible to show using SQL?
body: <p>I would like to know if there is any problem or any sort of combinations that can not be solved using SQL language.</p>
  
  <p>Is there any list in the web where I can find situations that are impossible to measure using SQL?</p>
  
  <p>Or is everything possible to calculate using SQL.</p>
  
  <p>Thank you.</p>