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3832. Find Users with Persistent Behavior Patterns
Hard

Table: activity

+--------------+---------+
| Column Name  | Type    |
+--------------+---------+
| user_id      | int     |
| action_date  | date    |
| action       | varchar |
+--------------+---------+
(user_id, action_date, action) is the primary key (unique value) for this table.
Each row represents a user performing a specific action on a given date.

Write a solution to identify behaviorally stable users based on the following definition:

  • A user is considered behaviorally stable if there exists a sequence of at least 5 consecutive days such that:
    • The user performed exactly one action per day during that period.
    • The action is the same on all those consecutive days.
  • If a user has multiple qualifying sequences, only consider the sequence with the maximum length.

Return the result table ordered by streak_length in descending order, then by user_id in ascending order.

The result format is in the following example.

 

Example:

Input:

activity table:

+---------+-------------+--------+
| user_id | action_date | action |
+---------+-------------+--------+
| 1       | 2024-01-01  | login  |
| 1       | 2024-01-02  | login  |
| 1       | 2024-01-03  | login  |
| 1       | 2024-01-04  | login  |
| 1       | 2024-01-05  | login  |
| 1       | 2024-01-06  | logout |
| 2       | 2024-01-01  | click  |
| 2       | 2024-01-02  | click  |
| 2       | 2024-01-03  | click  |
| 2       | 2024-01-04  | click  |
| 3       | 2024-01-01  | view   |
| 3       | 2024-01-02  | view   |
| 3       | 2024-01-03  | view   |
| 3       | 2024-01-04  | view   |
| 3       | 2024-01-05  | view   |
| 3       | 2024-01-06  | view   |
| 3       | 2024-01-07  | view   |
+---------+-------------+--------+

Output:

+---------+--------+---------------+------------+------------+
| user_id | action | streak_length | start_date | end_date   |
+---------+--------+---------------+------------+------------+
| 3       | view   | 7             | 2024-01-01 | 2024-01-07 |
| 1       | login  | 5             | 2024-01-01 | 2024-01-05 |
+---------+--------+---------------+------------+------------+

Explanation:

  • User 1:
    • Performed login from 2024-01-01 to 2024-01-05 on consecutive days
    • Each day has exactly one action, and the action is the same
    • Streak length = 5 (meets minimum requirement)
    • The action changes on 2024-01-06, ending the streak
  • User 2:
    • Performed click for only 4 consecutive days
    • Does not meet the minimum streak length of 5
    • Excluded from the result
  • User 3:
    • Performed view for 7 consecutive days
    • This is the longest valid sequence for this user
    • Included in the result

The Results table is ordered by streak_length in descending order, then by user_id in ascending order

 
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