Google Intern Interview

So had Google Intern Interview today at about 5 p.m. The guy who interviewed me was Nikhil.
He started by knowing my Project on Extended Smart SMS Converter. He more so emphasized on how was i implementing data structures and data base and it took me about 15-20 minutes to convince him that if it can be done without using any thing like that ( My foolishness was that i should have said if database and data structures and all could be implemented there in mobile phone then it would had been better to map each word's corresponding SMS Lingo).
After that he asked me theory questions which was least expected from me to remember, but i answered him partly correct i suppose (wasn't totally blank but had no answer to his question "Are You Sure?").

I think i didn't gave good impression. But thats what Project i had done and thats what i remembered about my course at that time. No problem if they think i can give them new ideas (which i am 100% sure i can) they will select otherwise ...