Opis Komedies - Part 12: delete it in SQL !!!!!

This happened couple of years back during my training. The instructor was teaching Oracle.We were all using SQL+, after completing normalities and stuff, atlast they came into real programming.First they introduced the command INSERT and after some days they taught us DELETE and TRUNCATE. While instructor was explaining DELETE command, i asked this historical question for which including instructor everyone fainted !!!!!

"Sir, why to have a seperate command to delete data?...instead we can use 'backspace' key and delete the entered data"

i wonder if he still continue there as an instructor !!!!!