title: SQL - group by query customization
body: <p>I am having a sql table contains the records as below,I want group by query 
      for the lesser Amount No present against each PropertyID and TenantID.
      For example:I want -2500 against PropertyID 1 TenantID 2.</p>
  
  <pre><code>PropertyID  TenantID    Amount
  1              2        -6000
  1              2        -2500
  3              3        -15000
  3              3        -10000      
  </code></pre>
  
  <p>Expected Output is below</p>
  
  <pre><code> PropertyID TenantID    Amount
   1             2        -2500
   3             3        -10000
  </code></pre>