👀 Views: 27 💬 Answers: 1 📅 Created: 2025-06-13

sql-server t-sql aggregate-functions T-SQL

I'm a bit lost with I recently switched to I tried several approaches but none seem to work..... I'm working with an scenario where my aggregate functions seem to be ignoring NULL values in a subquery, leading to unexpected results. I have a table named `Sales` with the following structure: ```sql CREATE TABLE Sales ( SaleID INT, Amount DECIMAL(10, 2), SaleDate DATE ); ``` I want to calculate the total sales amount for each month, but I have some NULL values in the `Amount` column that I expected to be counted as zero. Here is the query I'm currently using: ```sql SELECT MONTH(SaleDate) AS SaleMonth, SUM(Amount) AS TotalSales FROM Sales GROUP BY MONTH(SaleDate); ``` In some cases, the `TotalSales` for certain months is returning NULL instead of 0 when all `Amount` values for that month are NULL. I've tried using `COALESCE` like this: ```sql SELECT MONTH(SaleDate) AS SaleMonth, SUM(COALESCE(Amount, 0)) AS TotalSales FROM Sales GROUP BY MONTH(SaleDate); ``` However, this still doesn't return a row for months where there are no sales records at all, even though I want it to list the month with a total of 0 sales. I also attempted to create a calendar table to join with my sales data, but it still feels inefficient and cumbersome. Is there a more straightforward approach to ensure that I get all months listed with their totals, even if they are NULL or 0? I'm using SQL Server 2019. Any advice would be greatly appreciated! Any feedback is welcome! This is part of a larger desktop app I'm building. Thanks for your help in advance! Any ideas how to fix this? I appreciate any insights!