Todd Kleinhans has been working with SQL Server since 1999. He has worked as a dba, developer, data architect, manager, and consultant in a wide number of industries. He is currently a Senior SQL Server DBA at Good Sam Enterprises. Todd is also the current VP of Marketing for the Denver SQL Server User Group. He has presented at user groups, SQL Saturdays, and virtual groups too.

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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)

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