Articles

SQLServerCentral Article

Inside the SQL Server Query Optimizer

This book will take you from the fundamentals of Statistics, Cost Estimation, Index Selection, and the Execution Engine, and guide you through the inner workings of the Query Optimization process, and throws in a pragmatic look at Parameterization and Hints along the way.

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2017-02-06

27,367 reads

SQLServerCentral Article

SQL Server Execution Plans, Second Edition by Grant Fritchey

Every Database Administrator, developer, report writer, and anyone else who writes T-SQL to access SQL Server data, must understand how to read and interpret execution plans. This book leads you right from the basics of capturing plans, through how to interrupt them in their various forms, graphical or XML, and then how to use the information you find there to diagnose the most common causes of poor query performance, and so optimize your SQL queries, and improve your indexing strategy.

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2017-02-02

19,284 reads

Technical Article

Using A Block Predicate to Restrict Row Updates and Inserts

If you are using row level security in SQL Server 2016 you might find users are updating or inserting rows of data that keep them from seeing the row after they have performed the update or insert statement. If you want to prevent this from occurring, you can use a blocking predicate.

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2017-02-02

6,585 reads

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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