Simply perfect. We'll now try to write a more complicated version of the previous exercise.
For each rental date, show the rental_date, the sum of payment amounts (column name payment_amounts) from single_rentals on that day, the sum of payment_amounts on the previous day and the difference between these two values.
In this exercise, it is best to create a temporary table using WITH table_name AS (...). In the temporary table, group payment_amounts by dates. Once this table is ready, you can easily select the daily sum from that temporary table and the use the lag function to retrieve the value on the previous day.
