Troy Ketsdever


Technical Article

Find maximum values for all "int" columns

/******************************************************** "CheckAllInts" Find all columns in all user tables in a database defined as "int", and get the maximum value for the column. Uses a cursor and logs the results to a table. (One-time CREATE TABLE statement at top of script). Successive runs over an appropriate period of time would allow one to find how […]

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2005-04-11 (first published: )

355 reads

SQLServerCentral Article

An Identity Crisis

SQL Server includes autonumber of identity columns despite the fact that they are not SQL-92 compliant. There is quite a bit of debate over the use of them in your database, but if you do decide to use them, you should be aware of potential problems. New author Troy Ketsdever brings us a story about his identity crisis and how it was solved.

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2005-03-23

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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