3056. Snaps Analysis 🔒

Description

Table: Activities

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| activity_id   | int     |
| user_id       | int     |
| activity_type | enum    |
| time_spent    | decimal |
+---------------+---------+
activity_id is column of unique values for this table.
activity_type is an ENUM (category) type of ('send', 'open'). 
This table contains activity id, user id, activity type and time spent.

Table: Age

+-------------+------+
| Column Name | Type |
+-------------+------+
| user_id     | int  |
| age_bucket  | enum |
+-------------+------+
user_id is the column of unique values for this table.
age_bucket is an ENUM (category) type of ('21-25', '26-30', '31-35'). 
This table contains user id and age group.

Write a solution to calculate the percentage of the total time spent on sending and opening snaps for each age group. Precentage should be rounded to 2 decimal places.

Return the result table in any order.

The result format is in the following example.

 

Example 1:

Input: 
Activities table:
+-------------+---------+---------------+------------+
| activity_id | user_id | activity_type | time_spent |
+-------------+---------+---------------+------------+
| 7274        | 123     | open          | 4.50       | 
| 2425        | 123     | send          | 3.50       | 
| 1413        | 456     | send          | 5.67       | 
| 2536        | 456     | open          | 3.00       | 
| 8564        | 456     | send          | 8.24       | 
| 5235        | 789     | send          | 6.24       | 
| 4251        | 123     | open          | 1.25       | 
| 1435        | 789     | open          | 5.25       | 
+-------------+---------+---------------+------------+
Age table:
+---------+------------+
| user_id | age_bucket | 
+---------+------------+
| 123     | 31-35      | 
| 789     | 21-25      | 
| 456     | 26-30      | 
+---------+------------+
Output: 
+------------+-----------+-----------+
| age_bucket | send_perc | open_perc |
+------------+-----------+-----------+
| 31-35      | 37.84     | 62.16     |
| 26-30      | 82.26     | 17.74     |
| 21-25      | 54.31     | 45.69     |
+------------+-----------+-----------+
Explanation: 
For age group 31-35:
  - There is only one user belonging to this group with the user ID 123.
  - The total time spent on sending snaps by this user is 3.50, and the time spent on opening snaps is 4.50 + 1.25 = 5.75.
  - The overall time spent by this user is 3.50 + 5.75 = 9.25.
  - Therefore, the sending snap percentage will be (3.50 / 9.25) * 100 = 37.84, and the opening snap percentage will be (5.75 / 9.25) * 100 = 62.16.
For age group 26-30: 
  - There is only one user belonging to this group with the user ID 456. 
  - The total time spent on sending snaps by this user is 5.67 + 8.24 = 13.91, and the time spent on opening snaps is 3.00. 
  - The overall time spent by this user is 13.91 + 3.00 = 16.91. 
  - Therefore, the sending snap percentage will be (13.91 / 16.91) * 100 = 82.26, and the opening snap percentage will be (3.00 / 16.91) * 100 = 17.74.
For age group 21-25: 
  - There is only one user belonging to this group with the user ID 789. 
  - The total time spent on sending snaps by this user is 6.24, and the time spent on opening snaps is 5.25. 
  - The overall time spent by this user is 6.24 + 5.25 = 11.49. 
  - Therefore, the sending snap percentage will be (6.24 / 11.49) * 100 = 54.31, and the opening snap percentage will be (5.25 / 11.49) * 100 = 45.69.
All percentages in output table rounded to the two decimal places.

Solutions

Solution 1: Equi-Join + Group By Summation

We can perform an equi-join to connect the Activities table and the Age table based on user_id. Then, group by age_bucket and finally calculate the percentage of sends and opens for each age group.

MySQLPython3

# Write your MySQL query statement below
SELECT
    age_bucket,
    ROUND(100 * SUM(IF(activity_type = 'send', time_spent, 0)) / SUM(time_spent), 2) AS send_perc,
    ROUND(100 * SUM(IF(activity_type = 'open', time_spent, 0)) / SUM(time_spent), 2) AS open_perc
FROM
    Activities
    JOIN Age USING (user_id)
GROUP BY 1;

import pandas as pd


def snap_analysis(activities: pd.DataFrame, age: pd.DataFrame) -> pd.DataFrame:
    merged_df = pd.merge(activities, age, on="user_id")
    total_time_per_age_activity = (
        merged_df.groupby(["age_bucket", "activity_type"])["time_spent"]
        .sum()
        .reset_index()
    )
    pivot_df = total_time_per_age_activity.pivot(
        index="age_bucket", columns="activity_type", values="time_spent"
    ).reset_index()
    pivot_df = pivot_df.fillna(0)
    pivot_df["send_perc"] = round(
        100 * pivot_df["send"] / (pivot_df["send"] + pivot_df["open"]), 2
    )
    pivot_df["open_perc"] = round(
        100 * pivot_df["open"] / (pivot_df["send"] + pivot_df["open"]), 2
    )
    return pivot_df[["age_bucket", "send_perc", "open_perc"]]

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