SQLServerCentral Editorial

13 Disasters

This editorial that was originally published on Aug 15, 2007. It is being rerun as Steve is traveling. This editorial looks at the issues that happen in production and how you should perhaps plan for disasters.

SQLServerCentral Editorial

Tuning People?

Database people are used to changing the hardware of the server on which a problem database resides, or making changes to indexes and database settings, but humans and their organisations are far more difficult to tune and optimise than databases.

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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