mysql, group by, having count(*)
https://leetcode.com/submissions/detail/865539807/\n\n# Write your MySQL query statement below\nselect actor_id, director_id\nfrom ActorDirector\ngroup by actor
https://leetcode.com/submissions/detail/865539807/\n```\n# Write your MySQL query statement below\nselect actor_id, director_id\nfrom ActorDirector\ngroup by actor_id, director_id\nhaving count(*) >= 3\n```
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