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Password Help

Passwords control most of our access to computer systems and provide some level of authentication, but their security depends heavily on their strength and privacy. Steve Jones says you can set a good example for others and hemp improve security on all systems.

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2012-06-28

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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