SQLServerCentral Editorial

Life Logging

This editorial was orignally published on Dec 8, 2009. It is being re-run as Steve is on vacation. Would you like the idea of capturing everything you do? Audio, video, text, code, a log of your life. A new book from Microsoft Research talks about this and Steve Jones things it could be an interesting capability for your career.

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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