162. Percentage of users with mobile app

Let’s calculate the percentage of users who has the iPhone app installed.

⚠ Since the app was launched on Feb, 1, 2018 let’s consider only users who signed up on this date or later.

⚠ As usual, submit the integer part of the answer. For example, if the percentage was 19.87 submit 19 as the answer.

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Hi, it’s Anatoli, the author of SQL Habit. 👋

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-- Type in your query here. You might want to start by listing all records: SELECT * FROM devices
LIMIT 500
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