Each employee can only be in the employees table exactly one time. However, an employee can be in the orders table many times, once for each sale. This is an example of a(n) ________ relationship

Which aggregate function returns the maximum value of a value expression?

a. COUNT(*) b. COUNT(value expression) c. SUM(value expression) d. MAX(value expression)

Answer the following statements true (T) or false (F)

1. There is no need for error checking when popping a stack. 2. There is no need for error checking when pushing a stack. 3. Data is inserted into a queue at the back. 4. Data is removed at the back of the queue.