SQL Server: Query returning incorrect results when using LEFT JOIN with multiple conditions
I just started working with Hey everyone, I'm running into an issue that's driving me crazy. This might be a silly question, but Does anyone know how to I tried several approaches but none seem to work. I've looked through the documentation and I'm still confused about This might be a silly question, but I'm working with a question with a SQL Server query that uses a LEFT JOIN to combine data from two tables, and the results seem incorrect when applying multiple conditions in the ON clause... Specifically, I have two tables, `Orders` and `Customers`, and I want to return all orders, along with customer information, but only when the customer's status is 'active'. Here’s the query I'm using: ```sql SELECT o.OrderID, o.OrderDate, c.CustomerName FROM Orders o LEFT JOIN Customers c ON o.CustomerID = c.CustomerID AND c.Status = 'active' WHERE o.OrderDate >= '2023-01-01'; ``` The scenario I'm working with is that I am getting NULL for `CustomerName` even when there are active customers associated with the `OrderID`. I’ve also tried separating the conditions into the WHERE clause: ```sql SELECT o.OrderID, o.OrderDate, c.CustomerName FROM Orders o LEFT JOIN Customers c ON o.CustomerID = c.CustomerID WHERE c.Status = 'active' AND o.OrderDate >= '2023-01-01'; ``` This approach returns no results at all, which makes sense because the LEFT JOIN will return NULLs for customers not matching the condition. I’ve tried using COALESCE to handle NULL values, but it doesn’t resolve the core scenario. Am I misunderstanding how the JOIN conditions work, or is there a better way to structure this query? Any help would be greatly appreciated! I'm using SQL Server 2019 and the tables are properly indexed. This is part of a larger API I'm building. This is part of a larger web app I'm building. Thanks in advance! For reference, this is a production application. Any ideas how to fix this? I'm on CentOS using the latest version of Sql. Any examples would be super helpful. My team is using Sql for this REST API. I'm working with Sql in a Docker container on Windows 11. Am I approaching this the right way? This is part of a larger service I'm building. What am I doing wrong?