VERY SHORT QUESTION-ID

Q1. What do you understand by a record?

Q2. Is it possible to completely remove data duplication from a database?

Q3. What Do you understand by a primary key?

Q4. What do you mean by a foreign key?

Q5. Can a primary key contain null value?

Q6. What is a BASE?

Q7. Define DBMS functioning.

Q8. How does DBMS ensure data security.

Q9. Explain the primary key with the help of an example.