Sanket Naik

Joins Clarified

Sometimes its good to get back to basics - or to make sure you really know all the basics. This is a very good intro to all the different join types.

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2004-04-16

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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;