Technical Article

SQLSaturday #269: SQL South West, Exeter, UK

SQL South West user group are running their second SQL Saturday on March 21st and 22nd and have another spectacular schedule of technical content from SQL Server professionals from the UK, Europe and USA including SQL Server MVPs and Microsoft staff. All the session details and how to register for the full-day pre-con sessions or the free-to-attend Saturday:

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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