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Path to Your MCDBA

Did you know that the mean salary of a MCSE certified professional is $65,100, well above the industry standard (source MCP Magazine)? That's not including the long term benefits such as bonuses and promotions. No salary surveys have been conducted by Microsoft as of today for MCDBA certification. With the limited amount of MCDBA certified DBAs though, the demand far by out weighs the suply.

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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