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Introduction
Dates
Time
Timestamps
Extract functions
Timezone conversion
Intervals
Current date and time
Review
43. Exercise 4

Instruction

Wow, you've done it! Ok, let's move on.

Exercise

For each route, show its code together with the number of flights on that route and the average delay on that route. Only take into account flights older than 6 months. Don't show the routes with zero flights on it or NULL average delay. The column names should be: code, count, and avg.