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The Dangers When Changing Database File Names

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Recently a friend had an issue with their SQL Server as a result of a file change in their SQL Server database. In this short piece, I want to highlight the dangers of making some changes to an online database that might cause an unexpected outage. This is really the same whether you are changing […]

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2019-07-09

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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