[1075#_EASY] Project Employees I
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SQL/LeetCode
보호되어 있는 글입니다.
[1141_EASY] User Activity for the Past 30 Days I
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SQL/LeetCode
Table: Activity +---------------+---------+ | Column Name | Type | +---------------+---------+ | user_id | int | | session_id | int | | activity_date | date | | activity_type | enum | +---------------+---------+ There is no primary key for this table, it may have duplicate rows. The activity_type column is an ENUM of type ('open_session', 'end_session', 'scroll_down', 'send_message'). The table ..