Completion time by category
The evanston311 data includes a date_created timestamp from when each request was created and a date_completed timestamp for when it was completed. The difference between these tells us how long a request was open.
Which category of Evanston 311 requests takes the longest to complete?
Latihan ini adalah bagian dari kursus
Exploratory Data Analysis in SQL
Petunjuk latihan
- Compute the average difference between the completion timestamp and the creation timestamp by
category. - Order the results with the largest average time to complete the request first.
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
-- Select the category and the average completion time by category
SELECT ___,
___ AS completion_time
FROM evanston311
___
-- Order the results
___;