Setting a minimum charging cost
The company that owns these chargers wants to set a minimum charging cost for each city they operate. To do this, they'd like to make the cost of the tenth-cheapest charging cost for each city the minimum that each user must spend when charging their vehicle in any given session. As the resident Snowflake expert, it's your job to find this value for each city to eventually compare each record to it.
This exercise is part of the course
Window Functions in Snowflake
Exercise instructions
- Use a window function to find the tenth-smallest value of
charging_cost. - Partition data by
charging_station_locationto ensure that a minimum value is found for each city. - Alias the results as the
minimum_cost.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
SELECT
charging_station_location,
user_id,
charging_cost,
-- Find the tenth-smallest charging cost
___(___, ___) OVER(
-- Segment the data by charging_station_location
___
ORDER BY charging_cost
-- Alias the result as minimum_cost
) ___ ___
FROM ELECTRIC_VEHICLES.charging;