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What I’ve Been Up To

Just a short update. I haven’t blogged since May, and that’s because I’ve been presenting. Now, I have a publishing contract, so that’s keeping me busy. I want to...

2021-12-21

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8. prosince jsme se opet sešli u obeda nad novinkami ze sveta dat. Je super, že se stále více úcastní i lidé mimo JC – jsme rádi, že se...

2021-12-27 (first published: )

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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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