Editorials

SQLServerCentral Editorial

Who Are You?

I was sitting here thinking about the editorial when Kathi Kellenberger came to mind. She would frequently write about her favorite show, Star Trek. I too have been a fan of Star Trek since I was very young. However, my favorite show is a little more obscure and not as many people have seen it, […]

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2022-09-17

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SQLServerCentral Editorial

Things Move Fast

I have several things I’d like to say in the editorial today, but I feel I have to start off with my condolences to the family of Queen Elizabeth II. For that matter, my condolences to the people of Britain. This truly is the end of an era. Things do indeed move fast sometimes. Working […]

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2022-09-10

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SQLServerCentral Editorial

Developer Optimism

Developers, in general, are very optimistic about the code they write. This is likely one cause of their estimates of the time required being low, as well as the various bugs that slip through because of corner cases that appear for the problem being solved. Often developers think they've considered the various ways this code […]

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2022-09-07

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Blogs

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ORDER BY alias

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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