MySQL query returns empty set despite matching records in multiple tables
I'm maintaining legacy code that I'm trying to configure I'm testing a new approach and I'm reviewing some code and I'm relatively new to this, so bear with me... I'm trying to fetch user details along with their associated orders from two tables: `users` and `orders`. However, my query is returning an empty result set even though I can see the relevant records in both tables. Here's the structure of my tables: ```sql CREATE TABLE users ( id INT PRIMARY KEY, name VARCHAR(100) ); CREATE TABLE orders ( id INT PRIMARY KEY, user_id INT, amount DECIMAL(10, 2), FOREIGN KEY (user_id) REFERENCES users(id) ); ``` I've inserted some test data: ```sql INSERT INTO users (id, name) VALUES (1, 'Alice'), (2, 'Bob'); INSERT INTO orders (id, user_id, amount) VALUES (1, 1, 100.00), (2, 1, 150.00), (3, 2, 200.00); ``` I want to retrieve the names of users along with the total amount of their orders. Here's my query: ```sql SELECT u.name, SUM(o.amount) AS total_amount FROM users u JOIN orders o ON u.id = o.user_id WHERE u.id IN (1, 2) GROUP BY u.id; ``` This should return Alice with a total of 250.00 and Bob with 200.00. However, it results in an empty set. I have verified that both users have orders, and the foreign key relationships seem to be correctly established. I've tried running a simpler version of the query just fetching users: ```sql SELECT * FROM users WHERE id IN (1, 2); ``` This returns both users as expected. I also checked the data types for `user_id` in the `orders` table and `id` in the `users` table, and they both are `INT`. Am I missing something in my query logic, or is there a configuration issue with my MySQL server? I'm using MySQL version 8.0.23. Any insights would be appreciated! My development environment is Windows. Am I missing something obvious? For reference, this is a production mobile app. Am I approaching this the right way? I'm on Debian using the latest version of Sql. I'm open to any suggestions. I'm on Linux using the latest version of Sql. Any ideas how to fix this? I'm coming from a different tech stack and learning Sql. Thanks, I really appreciate it! The stack includes Sql and several other technologies. I'm open to any suggestions.