select distinct substring(name,1,1) from stamps ,color_master where color_master.color_code=stamps.color_code and color_master.color='Blue' and stamps.serial_no='0685' and year(stamps.issue_date)=1973 order by substring(name,1,1)
IndianPost
Color >> Blue >> Serial Number >> 0685 >> Issue Date >> year >> 1973 >> Alpha >> T >>