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Introduction to SQL Server Filtered Indexes

SQL Server filtered indexes can save space and improve performance if they are used properly. Under what circumstances can they be used? When are they most effective, and what sort of performance gain or space-saving is likely? How does a filtered index affect the choice of execution plan? Seth Delconte explores these questions with practical experiments.

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The Security of You

There is a lot of data out there that is specific to an individual, none more important perhaps than biometric data. Steve Jones writes a bit about the security implications involved in working with this data. (This editorial was originally published on Nov 10, 2008. It is being re-run as Steve is at SQL Bits.)

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Managing Your IT Data

A new application manages data from your IT machines and software, but doesn't use a database. Steve Jones talks a little about this. (This editorial was originally published on Jan 20, 2009. It is being re-run as Steve is at SQL Bits.)

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Question of the Day

ORDER BY alias

There is a table tmp_tab:

CREATE TABLE tmp_tab (
id int,
val int
);
INSERT INTO tmp_tab VALUES
(1, 1),
(2, NULL),
(3, 3),
(4, 4),
(5, 5);
You want to order the rows ids by the following expression:
    ISNULL(val, id) + 1
Which of the following queries produces the expected ordering and why? (Select all correct)

See possible answers