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Technical Article

Dynamic DBCC DBREINDEX

This script uses sysobjects and sysindexes to ID all tables in a database that are indexed, and/or clustered.  It then runs through per table all of the indexes and runs DBREINDEX with their fillfactor.  This eliminates having to maintain a list of all indexes and having code fail when it tries to modify indexes that […]

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2002-12-19

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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