title: remove trailing commas using sql
body: <p>I am doing some data mapping and out of my 15 columns on 5 will have data the rest will be empty.  When I export my fie as csv my columns that have no data return comas.  My vendor needs those trailing comas removed.  I tried using trim on one of the colmns and that did not work.  sample </p>
  
  <p>sample :</p>
  
  <blockquote>
    <p>Clientid,schoolc,schname,District,state,NCESid,PartnerID,Action,Reserved1,Reserved2,Reserved3,Reserved4,Reserved5,Reserved6,Reserved7,Reserved8,Reserved9,reserved10
    ca-rosev42441,26,barns Elementary,Sample City School
    District,CA,163364418255,,,,,,,,,,,,</p>
  </blockquote>