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SQLServerCentral Editorial

Friendship and Your Career

  • Editorial

PASS Data Community Summit is coming up like an out of control freight train. Another couple of weeks and it'll be here. I'm excited about it every year and I really hope to see you there. Please, consider this a personal invite to say hi if you see me around. I'm bringing all this up […]

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2022-10-29

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Technical Article

SQL Server Internals: Reading Pages

  • Article

The I/O from an instance of the SQL Server Database Engine includes logical and physical reads. A logical read occurs every time the Database Engine requests a page from the buffer cache. If the page is not currently in the buffer cache, a physical read first copies the page from disk into the cache.

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2022-10-17

SQLServerCentral Editorial

Learning New Technology Is Challenging

  • Editorial

On nights and weekends, I've been playing with Arduino controllers. I have a couple of projects I'm working through (building a robot that can roll around with "eyes" to avoid obstacles). I've also been trying to work with STM32 controllers, because in a lot of ways, they're more powerful than an Arduino. However, I've hit […]

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2022-10-08

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SQLServerCentral Editorial

Who Are You?

  • Editorial

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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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