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Introduction
Dealing with dates
Working with time data
Date and time date
Extracting dates and times
Doing arithmetic with dates
Converting date and time data
Building date and time data from parts
Summary and review
52. Exercise 4

Instruction

Wow, you’re making great progress! Here's another one.

Exercise

Group all flights by year. Show the year, and calculate the average delay time for each of those years. Name the columns Year and AvgDelay.