Adding and subtracting date and time values
In this exercise, you will calculate the actual number of days rented as well as the true expected_return_date by using the rental_duration column from the film table along with the familiar rental_date from the rental table.
This will require that you dust off the skills you learned from prior courses on how to join two or more tables together. To select columns from both the film and rental tables in a single query, we'll need to use the inventory table to join these two tables together since there is no explicit relationship between them. Let's give it a try!
Este exercício faz parte do curso
Functions for Manipulating Data in PostgreSQL
Exercício interativo prático
Experimente este exercício completando este código de exemplo.
SELECT f.title, f.rental_duration,
-- Calculate the number of days rented
___.___ - ___.___ AS ___
FROM film AS f
INNER JOIN inventory AS i ON f.film_id = i.film_id
INNER JOIN rental AS r ON i.inventory_id = r.inventory_id
ORDER BY f.title;