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  Tutorial: ASP Database Related Randomizing a Recordset Tutorial

This article describes several ways to use a SQL calculated field and the ORDER BY clause to arrange a recordset in random order. It provides a simple tool for verifying that the results are uniformly random. Also shows a technique for bubbling records wi

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Randomizing a Recordset With ASP Database

Shuffling a recordset so that it can be displayed in random order is very useful when programming dynamic Web pages. A database table containing a list of supported vendors or links to advertisers may need to be displayed in a different order each time so that none complain about always being last on the list.

Others have solved this problem by writing ASP code to reorganize the recordset by copying data into an array and then rearranging the data in memory (see http://www.asp101.com/articles/john/randomize/default.asp ). An alternative solution is to have SQL arrange the recordset for you by using an ORDER BY clause on a calculated column added to the query. Unfortunately, the calculation necessary to produce a uniformly random recordset is not straightforward, but this article will review several approaches and point out one that works reasonably well. The examples were written using SQL Server 7.0.


 

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