16. Average Subscriber Count

Solution ↗

Easy

Tables: channels

+-------------------------+-------------+
| Column Name             | Type        |
+-------------------------+-------------+
| channel_id              | varchar     |
| channel_name            | varchar     |
| subscriber_count        | bigint      |
| view_count              | bigint      |
+-------------------------+-------------+
channels contains one row per YouTube channel.
channel_id is the primary key for this table.

Write a SQL query to find the average value of subscriber_count across all channels.

Hint

Tip: AVG gives the mean across all channels.

Input:

channels table:
+------------+------------------+------------------+------------+
| channel_id | channel_name     | subscriber_count | view_count |
+------------+------------------+------------------+------------+
| C101       | Alpha Tech       | 2500000          | 92000000   |
| C102       | Data With Mira   | 1800000          | 71000000   |
| C103       | SQL Zone         | 950000           | 40000000   |
+------------+------------------+------------------+------------+

Output:

Output:
+----------------+
| avg_subscribers|
+----------------+
| 1750000        |
+----------------+

Explanation:

The average is computed across all channel rows.