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The Case for Patching

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Recently I was testing a feature in SQL Server on 2017 and 2019. There was supposed to be an improvement across versions, but I didn't see it. Then I realized that I was on SQL Server 2019 CU 2 on my laptop, and the current CU is 17. I took a few minutes to download […]

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2022-08-20

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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