MySQL conditional aggregation not yielding expected results with multiple criteria
I'm stuck on something that should probably be simple. I'm working with an scenario with a MySQL query that involves conditional aggregation. I'm trying to calculate the total sales for each product category based on the year, but the results are not aligning with my expectations. I have a `sales` table structured like this: ```sql CREATE TABLE sales ( id INT PRIMARY KEY, product_category VARCHAR(255), sale_amount DECIMAL(10, 2), sale_date DATE ); ``` The data I have looks something like this: ```sql INSERT INTO sales (id, product_category, sale_amount, sale_date) VALUES (1, 'Electronics', 200.00, '2023-01-15'), (2, 'Electronics', 150.00, '2023-02-20'), (3, 'Furniture', 300.00, '2023-01-10'), (4, 'Furniture', 400.00, '2023-03-25'); ``` I want to get the total sales amount for each category for the year 2023. My current query looks like this: ```sql SELECT product_category, SUM(CASE WHEN YEAR(sale_date) = 2023 THEN sale_amount ELSE 0 END) AS total_sales FROM sales GROUP BY product_category; ``` However, the output I'm getting is not matching the expected totals. The total for 'Electronics' should be 350.00, and for 'Furniture' it should be 700.00, but I'm getting 0 for both categories. I've tried running the query without the `CASE` statement, and I see that there are records for the year 2023. I've verified that the `sale_date` is stored correctly and matches the format. Also, I checked for any potential time zone issues, but those seem fine too. Is there something I'm missing in the query, or could there be a question with how MySQL is handling the `YEAR()` function? Any insights would be greatly appreciated! I've been using Sql for about a year now. Any feedback is welcome!