Siemens Internship interview questions

Tell me about yourself? What is the difference between heap and array? What is indexing? What are packages and modules? What is recursion? What is the primary key, unique key, foreign key? Asked to write a DBMS query? What is a relation? give a real-world example of recursion? What are scripting and programming? some questions on database some questions on javascript some question on python

Introduce yourself, do you know about OOP