Anthony Nocentino

Anthony Nocentino is the founder of Centino Systems. As an Enterprise Architect he works with clients to find right technology for their business, designing and deploying it, providing expertise on system performance and architecture. Creating well-designed, maintainable SQL Server and Linux based systems that enable clients to collect meaningful data that they can act upon. Anthony has a Bachelors and Masters in Computer Science and is working towards a Ph.D focusing on high performance/low latency data access algorithms on solid state disks. Anthony has a unique blend of academic and professional experience leveraged to help customers solve their hardest IT problems.

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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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