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Your user global app’s metrics might be muddled by a gotcha! Check out this SQL dev challenge about a common tracking issue that affects users worldwide. Tell us where we went wrong and how to fix it in the comments below.

Google for Developers

2,571,521 subscribers

23,832 次观看 • 1 年前 •via X (Twitter)

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Google for Developers 的头像

Google for Developers1 年前

Hint: Think about what happens when a user logs in at 11:59 PM in California while your server is in New York. Which day should that login count towards?

Ondřej Pařízek 的头像

Ondřej Pařízek1 年前

Hi, I think there's a timezone issue here. The query doesn't reflect each user's local time, which can lead to incorrect daily counts. Ideally, we should store the user's timezone and convert both login_time and CURRENT_DATE to that timezone when aggregating login data.

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