title: SQL query with equal limits for BETWEEN
body: <p>Suppose I have a query,</p>
  
  <pre><code>SELECT * FROM tab1 WHERE col1 BETWEEN  111 AND 111;
  </code></pre>
  
  <p>Or a query</p>
  
  <pre><code>SELECT * FROM tab1 WHERE col1=111;
  </code></pre>
  
  <p>Is there any difference in performance between the two? </p>
  
  <p>The table can be large, and is queried many times.</p>
  
  <p>EDIT: The query can have upto 15 fields in the WHERE clause like col1. Also, the columns are always a part of the primary key.</p>