select distinct substring(name,1,1) from stamps ,np_master where year(stamps.issue_date)=1991 and month(issue_date)=4 and stamps.serial_no='1450' and np_master.np_code=stamps.np_code and np_master.np='P' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1991 >> month >> April >> Serial Number >> 1450 >> Currency >> P >> Alpha >> H >>