MySQL 5.7: Problems with using GROUP BY in combination with aggregate functions and non-aggregated columns
I've looked through the documentation and I'm still confused about I'm refactoring my project and I've been banging my head against this for hours. I've looked through the documentation and I'm still confused about I'm using MySQL 5.7 and I've run into an scenario when trying to aggregate data from two tables using `GROUP BY`. I have a `sales` table that records transactions and a `products` table that lists product details. My goal is to get the total sales amount per product along with the corresponding product name. However, when executing the following query, I get unexpected results: ```sql SELECT p.product_name, SUM(s.amount) AS total_sales FROM products p JOIN sales s ON p.product_id = s.product_id GROUP BY p.product_name; ``` The SQL executes without errors, but the total sales amounts seem incorrect. For instance, one of the products should show a total of 200, but I’m getting 300 instead. I’ve checked the `sales` table and confirmed that the amounts are correct. To troubleshoot, I tried using different aggregate functions and modifying the `GROUP BY` clause, but the results remain inconsistent. I also ensured that there are no duplicate product names in the `products` table, but still, the scenario continues. I’ve looked up the default SQL mode settings and found that `ONLY_FULL_GROUP_BY` is enabled, which I thought would help, but I'm still unsure if my query is structured properly. Is there something I’m missing here, or is there an scenario with how MySQL is aggregating the data? Any insights would be appreciated! I'm working on a API that needs to handle this. This issue appeared after updating to Sql 3.11. For context: I'm using Sql on Windows 11. Is this even possible? My development environment is Linux. Hoping someone can shed some light on this.