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  3. Exploratory Data Analysis in SQL

Exercise

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?

Instructions

100 XP
  • 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.