title: Which SQL statement is faster? (HAVING vs. WHERE...)
body: <pre><code>SELECT NR_DZIALU, COUNT (NR_DZIALU) AS LICZ_PRAC_DZIALU
      FROM  PRACOWNICY
      GROUP BY NR_DZIALU
      HAVING NR_DZIALU = 30
  </code></pre>
  
  <p>or</p>
  
  <pre><code>SELECT NR_DZIALU, COUNT (NR_DZIALU) AS LICZ_PRAC_DZIALU
      FROM PRACOWNICY
      WHERE NR_DZIALU = 30
      GROUP BY NR_DZIALU
  </code></pre>