mysql_query("SELECT DISTINCT buyer,caseid,subject,service FROM s_support  ORDER BY id DESC ")

buyer               subject          service    case
abel@gmail.com ---- I need help ---- Other ---- 438613
bani@gmail.com ---- Urgent      ---- Other ---- 438612
rony@gmail.com ---- Help        ---- Other ---- 438611

buyer               subject          service    case
9   abel@gmail.com ---- I need help ---- Other ---- 438613
7   bani@gmail.com ---- Urgent      ---- Other ---- 438612
6   rony@gmail.com ---- Help        ---- Other ---- 438611