title: Difference between if exists (select 1 from) and (select 0 from)
body: <p>Is there any difference at all select 1 from and select 0 from or select any integer from?</p>
  
  <p>I know select * from is a expensive operation.</p>
  
  <p>However, select 1 from differs from select 0 from and or select 29 from?</p>
  
  <p>In the context of just checking if a table/stored procedure exists and if exists, drop it and recreate (In these scenarios)</p>