SQLite: Getting NULL Values Instead of Expected Aggregates with GROUP BY and HAVING Clauses
I'm integrating two systems and I'm working with SQLite version 3.36.0 and I've run into an issue where I'm getting NULL values instead of the expected aggregates when using GROUP BY and HAVING clauses. I have a table called `sales` with columns `id`, `product_id`, `quantity`, and `sale_date`. My goal is to calculate the total quantity sold for each product in the year 2023, but my query returns NULL for some products. Here's the query I've written: ```sql SELECT product_id, SUM(quantity) as total_quantity FROM sales WHERE strftime('%Y', sale_date) = '2023' GROUP BY product_id HAVING total_quantity > 100; ``` Despite having records that should satisfy the `HAVING` condition, I notice that products that have less than or exactly 100 sold are returning NULL. I have verified that there are indeed records in `sales` for those products, but they aren’t appearing in the results. I've tried using `COALESCE` to ensure that I get zeros instead of NULLs, but it doesn't seem to be addressing the absence of rows entirely. Here’s an attempt with COALESCE that I made: ```sql SELECT product_id, COALESCE(SUM(quantity), 0) as total_quantity FROM sales WHERE strftime('%Y', sale_date) = '2023' GROUP BY product_id HAVING total_quantity > 100; ``` This still returns NULL for the products that do not meet the threshold. I’ve also confirmed that there are no filters or joins that might cause some products to disappear from the result set. Is there a way to adjust my query to ensure that all products are included in the result, or am I misunderstanding how the HAVING clause interacts with GROUP BY in SQLite? Any insights would be greatly appreciated! This issue appeared after updating to Sql LTS. Any ideas how to fix this?