SQLServerCentral Editorial

Double Checks

Many of us have checks in place on systems or processes, but would we be aware of tampering with the operation of our computer systems? Steve Jones notes that auditing can be important to ensure things are working well.

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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