Which of the following is not a responsibility of a database administrator?

SQL commands do not include which of the following?

A persistent collection of interrelated data items can be defined as which of the following?

Which one of the following is commonly used for retrofitting multilevel security to a Database
Management System?

Which of the following is the marriage of object-oriented and relational technologies combining the
attributes of both?

A department manager has read access to the salaries of the employees in his/her department but
not to the salaries of employees in other departments. A database security mechanism that
enforces this policy would typically be said to provide which of the following?