Deutsche Bank Software Developer interview questions

As I entered the interview room interviewee asked me to introduce myself. Then he asked me about the most challenging project I have done and why this project is so much challenging to you. I explained him the project from the scrap and but at the end he was not satisfied with my explanation then I again explained the project to him. After that he asked me to explain my website project then he got satisfied with my both projects. Then he asked me you have interest in Operating system, OOP’s and Data Structure how you will be perfect for this profile then I explained him this by giving him a real life example. Then he asked why DB? and any query for me? I asked him Some question about the logo of DB.