title: What does "select count(1) from table_name" on any database tables mean?
body: <p>When we execute <code>select count(*) from table_name</code> it returns the number of rows.</p>
  
  <p>What does <code>count(1)</code> do? What does <code>1</code> signify here? Is this the same as <code>count(*)</code> (as it gives the same result on execution)?</p>