random selection of rows from a table | SQL Server Performance Forums

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random selection of rows from a table

if there are 100 rows in a table and we have to select 10 random rows
in such a way that every time we fire the query , the result set has
new 10 randomly selected rows….
Try the following…
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In T-SQL, if you don’t use an ORDER BY clause, you always have a chance of getting the results in random order. This means you are already getting random rows by not specifying any form of ORDER BY. Problem is that this randomness is not considered to be random enough, because a lot of the time you will see the same rows, more often than not returned in the same order. But strictly speaking, using ORDER BY NEWID() is overkill. Instead of "randomly selected rows", the assignment should have asked for "unpredictably selected rows".
Here’s a link that may be able to help you, which is similar to MohammedU’s answer: http://www.sql-server-helper.com/tips/generate-random-records.aspx SQL Server Helper
I wasn’t trying to say MohammedU’s solution is not the correct one – just making an observation.<br /><br />Note that I qualified it by "strictly speaking".[<img src=’/community/emoticons/emotion-1.gif’ alt=’:)‘ />]
mohammad solution is working…
Do you receive any message that row size is ended and no more records entered?
When you update any row in enterprise manager in physical table, is there any option to roll back as auto commit is on in SQL server or you physically select the row and update information?
Please solve these issues.
Have you read Frank’s reply in your threadhttp://www.sql-server-performance.com/forum/topic.asp?TOPIC_ID=21395 and it seems you haven’t got a complete understanding and there will be no use in hijacking others thread with your problem. Satya SKJ
Microsoft SQL Server MVP
Writer, Contributing Editor & Moderator
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