select distinct substring(name,1,1) from stamps ,color_master where color_master.color_code=stamps.color_code and color_master.color='Violet' and year(stamps.issue_date)=1976 and stamps.serial_no='0820' order by substring(name,1,1)
IndianPost
Color >> Violet >> Issue Date >> year >> 1976 >> Serial Number >> 0820 >> Alpha >> W >>