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Pre-Con in Denver

As prep for our pre-con at the PASS Summit, Kendra and I are presenting a pre-con at the Denver SQL Saturday#908, on Friday, October 11, 2019. We’ll be talking...

2019-09-27

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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