SELECT wo.WORKORDERID "Request ID",
       max(aau.FIRST_NAME) "Requester",
       max(wo.TITLE) "Subject",
       max(ti.FIRST_NAME) "Technician",
       longtodate(max(wo.CREATEDTIME)) "Created Time",
       CASE
           WHEN max(wos.notificationstatus) = 'REQ_REPLY' THEN max(c.description)
           WHEN max(wos.notificationstatus) = 'TECH_REPLY' THEN max(n.description)
           ELSE NULL
       END "Last conversation" FROM WorkOrder wo
LEFT JOIN SDUser sdu ON wo.REQUESTERID=sdu.USERID
LEFT JOIN AaaUser aau ON sdu.USERID=aau.USER_ID
LEFT JOIN WorkOrderStates wos ON wo.WORKORDERID=wos.WORKORDERID
LEFT JOIN SDUser td ON wos.OWNERID=td.USERID
LEFT JOIN AaaUser ti ON td.USERID=ti.USER_ID
LEFT JOIN StatusDefinition std ON wos.STATUSID=std.STATUSID
LEFT JOIN
  (SELECT con.workorderid,
          cond.description FROM conversation con
   LEFT JOIN aaauser au1 ON con.requesterid=au1.user_id
   LEFT JOIN conversationdescription cond ON con.CONVERSATIONID= cond.CONVERSATIONID) c ON c.workorderid=wo.workorderid
LEFT JOIN
  (SELECT nw.workorderid,
          nod.description FROM notify_workorder nw
   LEFT JOIN notification NO ON nw.notificationid=no.notificationid
   LEFT JOIN aaauser au2 ON no.senderid=au2.user_id
   LEFT JOIN notificationtodesc nod ON no.NOTIFICATIONID=nod.NOTIFICATIONID
   WHERE no.senderid !=1) n ON n.workorderid=wo.workorderid
WHERE std.ispending='1'
GROUP BY wo.WORKORDERID