title: Last_Value returning the current value
body: <p>I am not able to get the last value, rather it is just returning the same value with my code below in snowflake - does anyone have any idea? Is there something glaring wrong?</p>
  
  <pre><code>select MNTH, 
         sum_cust, 
         last_value(sum_cust) over (partition by MNTH order by sum_cust desc ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) as sum_cust_last
  from block_2;
  </code></pre>