Write a select statement that returns these columns from the orders table: the order_id column the order_date column a column named approx_ship_date that’s calculated by adding 2 days to the order_date column the ship_date column if it doesn’t contain a null value a column named days_to_ship that shows the number of days between the order date and the ship date when you have this working, add a where clause that retrieves just the orders for march 2018.