When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green.
Which of the following best describes the primary function of a database index?
Which of the following best defines the concept of the "Internet of Things" (IoT)?
In the context of a relational database, which of the following is NOT a characteristic of a candidate key ?
Which SQL query will correctly calculate the average salary of employees in each department and group them by department in a table named 'employees'?
