sql question: Application usage data is kept in the following table:
Table sessions: Id, userId, duration, data_timestamp
Write a query that selects userId and average session duration for each “Good User”.
Good User - a user with an average of at least 3 sessions in a week

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sql question: Application usage data is kept in the following table:
Table sessions: Id, userId, duration, data_timestamp
Write a query that selects userId and average session duration for each “Good User”. 
Good User - a user with an average of at least 3 sessions in a week

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