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Migrate existing DB Mail Exchange Configuration with New

Sometime due to the heavy load in Exchange servers we received configuration alerts notifications and report delay and that time it is require to move to some other exchange servers to full fill the requirement during the critical periods.

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2015-10-06 (first published: )

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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