title: Does unused tables in from clause impact performance of query?
body: <p>I am forming query dynamically .One thing I have noticed if  query has unused table  in 'FROM' clause  it is impacting performance. Just want to know is this behavior is  correct ? I am using SYBASE DB.</p>
  
  <p>EDIT
  unused table means  I have included it in from clause but I am not using it in where clause</p>