MySQL 8.0 – guide with Date Arithmetic Leading to Incorrect Results in Aggregation
I'm trying to configure I'm confused about After trying multiple solutions online, I still can't figure this out... I'm currently working with an scenario with date arithmetic in MySQL 8.0 that leads to incorrect results when performing aggregation. I have a table called `orders` where each order has a `created_at` timestamp. I'm trying to calculate the number of orders placed in the last 30 days grouped by day. Here's the query I'm using: ```sql SELECT DATE(created_at) AS order_date, COUNT(*) AS total_orders FROM orders WHERE created_at >= NOW() - INTERVAL 30 DAY GROUP BY order_date ORDER BY order_date; ``` While testing, the results seem to skip certain dates entirely, which doesn't match my expectations based on the data I know exists. For instance, if I confirm that orders were placed on `2023-09-15` and `2023-09-17`, but the query returns data only for `2023-09-16`, something seems off. I’ve validated that there are indeed rows with `created_at` values within the last 30 days, and I also checked using `SELECT * FROM orders WHERE created_at = '2023-09-15';` to confirm their existence. I also tried running the query without the grouping to see if the `WHERE` clause filters out rows incorrectly, but it returns a valid count. Could this scenario stem from timezone settings? I noticed that the server's timezone is set to `UTC` while the application is in `America/New_York`. I've also tried adjusting the `created_at` timestamps to ensure they fall within the right range but still get the same results. Is there something I'm missing in the configuration or logic here? Any suggestions for debugging this would be greatly appreciated. Any ideas what could be causing this? This is happening in both development and production on macOS. Any advice would be much appreciated. This is part of a larger REST API I'm building.