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Webinar – Data Warehouse Modernization

I’m delighted to announce I’m participating in a panel discussion about data warehouse modernization. The full title is “Data Warehouse Modernization – Crafting a Successful Migration Strategy ​​​​​​​Post Pande​​​​​​​mic​​”....

2022-05-05

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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)

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