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Stories to Engage Us

I've always been fascinated by history. For a long time growing up, my plan was to become a history teacher. While that didn't work out, I've continued to read quite a lot of history, both popular and scholarly works. One of the things about it that I find most fascinating are the stories. History is […]

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2021-03-06

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SQLServerCentral Editorial

Common Table Expression Misunderstandings

I frequently use Common Table Expressions (CTEs) when I demo windowing functions and get questions about them. Windowing functions are limited to the SELECT and ORDER BY clause which means that you can’t filter or group on them directly. Using a CTE is one way to separate the logic of the query into multiple steps […]

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2021-02-27

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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