Lynn Pettis

  • Interests: Sci Fi, Fantasy, Swords and Sorcery, Computers, Soccer (coach and ref)

Technical Article

Comparing Hardcoded functions, In-Line TVF's, and Scalar Functions

While perusing some of the threads on SQLServerCentral.com one of the questions that hit me was regarding the use of scalar functions in queries. In this particular case, in the column list of a SELECT statement. Did it make sense to encapsulate a routine...

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2009-05-12

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SQLServerCentral Article

Calculating Age

T-SQL calculations can get tricky at times, and since you often work with multiple rows, it's good to be exact in your data manipulation. New author Lynn Pettis brings us an article about calculating ages.

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2009-03-13 (first published: )

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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