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Why Getting Data Right Matters

An InfoWorld article from 2017 suggests that 80 percent of a data scientist’s job is cleaning and transforming data, and I believe this is probably only true for organizations that spend at least an average effort in designing and implementing their data storage. These persons who have trained to analyze data using complex math formulas […]

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2020-02-01

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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