Noam Brezis

Blog Post

Pro and Cons of Parameter Sniffing

Look at the following 3 scripts:
-- 1. Hardcoded
SELECT
*
FROM
Sales.Orders
WHERE
DateAndTime < '19900101'

-- 2. Variable
DECLARE @FilterDate DATETIME = '19900101'
SELECT
*
FROM
Sales.Orders
WHERE
DateAndTime...

2012-01-02

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The Empty Aggregate

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Question of the Day

The Empty Aggregate

I have this table in a SQL Server 2025 database: 

CREATE TABLE [dbo].[CustomerOrder]
(
[OrderID] [int] NULL,
[CustomerID] [int] NULL,
[total] [money] NULL
) ON [PRIMARY]
GO
What is returned from this code? (answers are for the sum and then the count) 
SELECT SUM(total) AS sum,
       COUNT(total) AS count
FROM dbo.CustomerOrder;

See possible answers