Editorials

SQLServerCentral Editorial

Volunteer For Something

I spent a chunk of the day yesterday, after work, but before working on a new book (yeah, I've got two jobs now), playing with my radios. I was programming the digital one to get it to use my Raspberry Pi as a hotspot (it used to work, now it doesn't). I also spent some […]

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2021-09-25

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SQLServerCentral Editorial

All the Tools in Your Toolbox

I recently began writing an article to compare the performance of several window functions to traditional query methods. I began with my favorite function, LAG, but soon found that there were so many other ways to write the query that the article never covered the additional window functions. The article was quite fun to write, […]

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2021-09-18

216 reads

SQLServerCentral Editorial

Unix vs PowerShell

I saw an article on using awk, sed, and grep on Linux. I used to know how to use those, though I was by no means an expert. However, working with a stream of text with an input and output was a valuable skill I've used over and over in my career. There are plenty […]

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2021-09-13

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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