SQLite Query with Subqueries Returning Unexpected NULL Values
I'm working on a personal project and I'm working with an scenario with an SQLite query that's using subqueries to filter results, but it's returning unexpected NULL values. I'm working with SQLite version 3.35.5 and trying to retrieve data from two tables: `orders` and `customers`. My current query looks like this: ```sql SELECT o.id, o.amount FROM orders o WHERE o.customer_id IN ( SELECT c.id FROM customers c WHERE c.status = 'active' ) AND o.amount > 100; ``` I expect to get all orders above $100 from active customers, but I'm getting rows where `amount` is NULL. I double-checked that the `customer_id` in `orders` matches `id` in `customers` correctly. I also tried modifying the query to use a `JOIN` instead of a subquery: ```sql SELECT o.id, o.amount FROM orders o JOIN customers c ON o.customer_id = c.id WHERE c.status = 'active' AND o.amount > 100; ``` However, this approach results in the same NULL values for `o.amount`. I've verified that the `amount` column in the `orders` table does not contain NULLs, and I've run `SELECT * FROM orders WHERE amount IS NULL;` to confirm that. To further debug, I tried running a simpler query: ```sql SELECT * FROM orders WHERE customer_id IN (1, 2, 3); ``` Which returned valid results, so it seems like the scenario originates from the filtering on `customer_id`. Any idea why the subquery or `JOIN` would lead to NULL results in the output? Could it be related to how SQLite handles data types or NULL values in subqueries? I'm really exploring here and would appreciate any insights on how to resolve this scenario. I'm working on a web app that needs to handle this. Thanks in advance! I'm on Windows 10 using the latest version of Sql. Am I missing something obvious?