How do I find the difference between two time periods?

Apart from the standard datediff() and timestampdiff(), Vertica and MySQL offer a couple of more ways to go about it: By using the age functions:  age_in_years (current date, start date) and  age_in_months (current date, start date)  A key thing to remember about these two is that, unlike  datediff ('years', start date, current date), they will calculate the months/years between the …