Emails Opened
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Let’s say you have a table called events that keeps track of every user’s actions. A small example of the events table would look like this:
| user_id | created_at | action | platform |
|---|---|---|---|
| 1 | 2021-01-01 12:00:00 | email_opened | Android |
| 2 | 2021-01-01 12:05:00 | like | Outlook |
| 3 | 2021-01-01 12:10:00 | post_enter | Gmail |
| 4 | 2021-01-01 12:15:00 | post_cancel | Outlook |
| 5 | 2021-01-01 12:20:00 | like | Gmail |
Using this information, you wish to find out how many users have opened an email.
What query would you use to find out?
Example:
Input:
events table
| Column | Type |
|---|---|
| user_id | INTEGER |
| created_at | DATETIME |
| action | VARCHAR |
| platform | VARCHAR |
Output:
| Column | Type |
|---|---|
| num_users_open_email | INTEGER |
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