title: Does use of COALESCE slows down the query performance
body: <p>I was just curious to know that the use of COALESCE slows down the query performance. I read it in an article that we should avoid using COALESE and instead of it, we should use case for this. Is it really true about COALESE that it hinders the query perfromance? Any help will be appreciated.</p>
  
  <p>Thanks</p>