select distinct substring(name,1,1) from stamps ,np_master where year(stamps.issue_date)=1964 and month(issue_date)=12 and np_master.np_code=stamps.np_code and np_master.np='P' and stamps.serial_no='0493' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1964 >> month >> December >> Currency >> P >> Serial Number >> 0493 >> Alpha >> S >>