Intuit Developer interview questions

What is a database and database management system and why it is preferred over traditional file management systems? I was knowing the answer very well and explained it very clearly. In the second question, I was supposed to write the SQL query as per the conditions given by the interviewer. In this, I was supposed to write the query in the editor (the editors link was previously given by them in the mail). For this question, I was able to give two methods one by writing from scratch and the other by using prebuilt functions. The third question I was asked was based on the OOPs concept. I was asked about the pillars of OOPs. After this, I was asked to explain polymorphism and its types with some examples. The fourth question was about the difference between function overloading and overriding. The last question was based on OS i.e. Explain the threading concept in OS