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Database structure queries

Gets most important information of database structure. This includes all user tables, their fields, datatypes, defaults (including default constraint names), etc, primary keys and their fields, unique constraints and their fields, check constraints (including their conditions), foreign key constraints and their fields aswell as any other indexes and their fields. Should be quite useful for […]

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2002-04-08

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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