MySQL query with GROUP_CONCAT() returning NULL values in Laravel when using GROUP BY
I'm performance testing and I've been banging my head against this for hours. I'm experiencing an scenario with a MySQL query in Laravel where I'm trying to use `GROUP_CONCAT` to aggregate values, but I'm getting NULL for some rows instead of the expected concatenated string... I'm using Laravel 9 and the MySQL version is 8.0. I have a table `orders` with the following structure: ```sql CREATE TABLE orders ( id INT AUTO_INCREMENT PRIMARY KEY, user_id INT, product_name VARCHAR(255), quantity INT ); ``` I want to group the orders by `user_id` and get a list of products ordered by each user, like this: ```sql SELECT user_id, GROUP_CONCAT(product_name) AS products FROM orders GROUP BY user_id; ``` However, I'm finding that some users return NULL in the `products` field when they should have valid values. I've checked and there are indeed products associated with those user IDs. I've also tried running the raw SQL directly in MySQL Workbench, and it works fine there. In Laravel, I have: ```php $results = DB::table('orders') ->select('user_id', DB::raw('GROUP_CONCAT(product_name) AS products')) ->groupBy('user_id') ->get(); ``` The `$results` collection is showing NULL for some users. I suspect it might be related to how Laravel handles NULL values or the query execution context. I've also ensured that the `product_name` column does not contain any NULL values. Is there a nuance in using `GROUP_CONCAT` with Laravel that I'm missing, or is there a way to ensure that I retrieve valid concatenated strings for all users? For context: I'm using Php on Ubuntu. Thanks in advance! This is happening in both development and production on CentOS. For context: I'm using Php on Windows 11. Could someone point me to the right documentation?