Which of the following statements are correct with regard to PostgreSQL?

The names of those departments where there are more than 100 employees have to be displayed. Given two relations, employees and departments, which query should be used?

Employee

---------

Empno

Employeename

Salary

Deptno

Department

---------

Deptno

Departname

Which of the following cannot be used as the operator name while creating a new operator?

Which of the following date and time constants are not defined in PostgreSQL?

Data validation can be implemented at the definition stage through:

Which of the following copy commands will work in PostgreSQL?

PostgreSQL is so lightweight that performance and reliability are not affected by hardware.

A VACUUM operation is used:

The core PostgreSQL source code includes what interfaces?

ALTER TABLE may be issued while a VACUUM process is running.

Within a table, a single column may be encrypted.