Instruction
Good job! We'll do one more exercise before we move on.
Exercise
Create a report of the average time to first order for weekly registration cohorts from 2017 in each registration channel. Show the following columns: week, channel_name, and avg_days_to_first_order. Order the results by the week.
Stuck? Here's a hint!
Use the following piece of code to calculate the average time:
AVG(first_order_date - registration_date)




