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Teams Power Users [Microsoft SQL Interview Question]
Write a query to find the top 2 power users who sent the most messages on Microsoft Teams in August 2022. Display the IDs of these 2 users along with the total number of messages they sent. Output the results in descending count of the messages.
Assumption:
- No two users has sent the same number of messages in August 2022.
Table:
| Column Name | Type |
|---|---|
| message_id | integer |
| sender_id | integer |
| receiver_id | integer |
| content | varchar |
| sent_date | datetime |
Example Input:
| message_id | sender_id | receiver_id | content | sent_date |
|---|---|---|---|---|
| 901 | 3601 | 4500 | You up? | 08/03/2022 00:00:00 |
| 902 | 4500 | 3601 | Only if you're buying | 08/03/2022 00:00:00 |
| 743 | 3601 | 8752 | Let's take this offline | 06/14/2022 00:00:00 |
| 922 | 3601 | 4500 | Get on the call | 08/10/2022 00:00:00 |
Example Output:
| sender_id | message_count |
|---|---|
| 3601 | 2 |
| 4500 | 1 |
The dataset you are querying against may have different input & output - this is just an example!
Solution
Before we can find the top 2 Microsoft Teams power users, we need to know how many messages were sent by each Microsoft Teams user in August 2022. We will refer to these users as "senders".
First, we extract the month and year from the field. Then, we count the messages for each sender and group them based on the :
Here over here to learn more about the function, and here to learn about the clause.
The output from the above query should look something like this:
| sender_id | count_messages |
|---|---|
| 2520 | 3 |
| 3601 | 4 |
| 4500 | 1 |
Because we're operating under the assumption that no two users can send the same number of messages in August 2022, we know that each number in the column will only appear once. That means that a simple clause in descending order will give us the result we need. We then use a clause to pull only the top 2 results, and we're done!
Solution:
PostgreSQL 14