Scripts

Technical Article

Finding the Nth Maximal Value

This procedure gets a tablename, column and an integer number N as parameters and finds the Nth maximum value of the column's value in a table for example :  running it with 'products', 'UnitPrice' , 13 ,  @reswill get the 13TH largest value of unitprice from products is no such N exist an error message […]

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2002-07-10

264 reads

Technical Article

Find Duplicated rows

This is a very simple and small stored procedure which will help you identify repeated rows on any given table.  This is specially useful for situations when you want to clean up a table and add a primary key on it, but you cannot until all duplication is eliminated.  Only two parameter are necessary; table […]

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2002-07-08

1,096 reads

Technical Article

Dynamically Alter all your Tables.....

This script allows you to dynamically alter all the tables in your database.  In the script i am building up an alter statement that adds a 'TimeStamp' column a table.If anyone knows a better way to do this kind of thing, feel free to drop me a mail (jamie.moffat@infographics.co.uk)

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2002-07-04

778 reads

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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