Gordon Pollokoff

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SQLServerCentral Article

A Case Study in Performance Tuning

SQL Server does a wonderful job of tuning itself, selecting the optimum query plans and in general performing very well under a variety of conditions. That does not mean the a good DBA cannot add value by setting up the system and ensuring the optimizer receives the information that it needs. New author Gordon Pollokoff brings us a short case study from a project he as recently involved in where a new application required a bit of tuning.

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2005-01-24

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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)

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