select distinct substring(name,1,1) from stamps ,np_master where year(stamps.issue_date)=1987 and month(issue_date)=6 and np_master.np_code=stamps.np_code and np_master.np='P' and stamps.serial_no='1234' order by substring(name,1,1)
IndianPost
Issue Date >> year >> 1987 >> month >> June >> Currency >> P >> Serial Number >> 1234 >> Alpha >> D >>