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SQLServerCentral Editorial

Take Care

  • Editorial

The world seems to be proceeding through some stuff at the moment. IT and our industry as a whole, equally seems to be going through some stuff. As such, allow this oldster to offer some advice: Take care of yourself. I know, I'm the same, you may have responsibilities for others. You need to take […]

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2024-05-04

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SQLServerCentral Editorial

One more reason to use foreign key constraints

  • Editorial

Since the title might be considered a bit vague, I don’t want you to wade through the article to figure it out. I will spare you the typical clickbait introduction, with me telling you what a foreign key constraint is, and why it and all the other constraint types provided by relational engines are useful. […]

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2024-04-27

287 reads

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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