Foundations Track · Medium · 25 min
9822 Average Number Of Friends
SELECT AVG(t2.num_friends) as avg_num_friends_per_user FROM ( SELECT t1.user, COUNT(friend) as num_friends FROM ( SELECT user_id as user, friend_id as friend...
Company labels are directional practice context, not official interview guidance.
Objective
Practice aggregation through a Google-tagged business scenario.
Approach
Use this track to lock in clean query structure, basic filtering logic, and confidence with grouped output.
Company context
Company labels are directional practice context, not official interview guidance.
SELECT AVG(t2.num_friends) as avg_num_friends_per_user FROM ( SELECT t1.user, COUNT(friend) as num_friends FROM ( SELECT user_id as user, friend_id as friend FROM google_friends_network UNION SELECT friend_id as user, user_id as friend FROM google_friends_network ) t1 GROUP BY 1 ) t2;
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