Comments on: Selecting Random Records With SQL

By: P. F.

P. F. — Fri, 25 Nov 2011 19:49:17 +0000

Thank you for your thorough explanation and use of the RAND() function. It helped save me time and also expanded my SQL experience.

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By: Ravi Parashar

Ravi Parashar — Tue, 27 Sep 2011 07:54:29 +0000

Select * From Emp
Order By NewID()

By: Il blog di Gabriele Favrin » Archivio del blog » Estrarre un record a caso da una tabella di un database SQL

Sun, 18 Sep 2011 21:02:01 +0000

[...] cosi’ provato a interrogare Google e ho trovato questa magnifica pagina che insegna un trucco davvero [...]

By: Jai@gotaninterviewcall

Jai@gotaninterviewcall — Mon, 18 Jul 2011 06:07:59 +0000

Good post. It saved me lot of time.

Even the query is optimized for getting random records.

By: partha

partha — Fri, 01 Jul 2011 19:14:02 +0000

how i can fetch record randomly from a table without rand() in Mysql??

By: Select random sample from SQLite table | Ecostudies

Select random sample from SQLite table | Ecostudies — Sat, 16 Apr 2011 20:49:45 +0000

[...] A much more extended example is given by Romain (the author of QSpatialite, about which I wrote before). For examples how to do this in other databases, see this webpage. [...]

By: Manish Choudhary

Manish Choudhary — Sun, 20 Mar 2011 15:58:10 +0000

Yups Great post, my problem has been solved by using SQL SERVER NEWID() Function.

By: Kadama

Kadama — Sat, 06 Nov 2010 09:57:38 +0000

I had being seaching for these information for long time with vain. it clear, simple and it working.

Thanks

By: SQL – Select Random Records From Table « Eureka!

SQL – Select Random Records From Table « Eureka! — Fri, 09 Jul 2010 16:02:41 +0000

[...] The number of return records depends on the LIMIT value and you could find other database SQL and the tests details at CarlJ.ca – Selecting Random Records With SQL. [...]

By: Kirk

Kirk — Sat, 30 Jan 2010 14:29:22 +0000

I find it incredible that I can not find a way good way to select random records from a DB2 table by a record pointer of some type. This would be necessary for large tables. Those in the millions of records. Selecting by a record pointer would eliminate the need of dumping the entire table to just get a sampling.

By: Bharat Mane

Bharat Mane — Thu, 10 Sep 2009 06:42:43 +0000

This is what, I was looking for, and it saved my few hours of efforts.

Thank you so much

By: shashank

shashank — Mon, 31 Aug 2009 14:46:21 +0000

good info. i NEWID() is new to me. thanks for the post. i am using the SQL is one of my projects now.

By: samantha

samantha — Fri, 07 Aug 2009 07:55:16 +0000

Dear all,

I have this problem in mysql database trigger.

I have two tables namely messagein and messageout.

I want to update messageout table when a message received to messagein table.
So I wrote a database trigger in mysql.
I am using wamp-php admin,
Code as follows,

create trigger autoreply after insert on ozekimessagein
FOR each row
begin
DECLARE tel VARCHAR(30);
SELECT @tel=sender FROM ozekimessagein ORDER BY sender DESC limit 1;
INSERT INTO ozekimessageout(receiver,msg,statuss) VALUES (@tel,’Thank you for the
message’,’send’);
end

But when it runs give an mysql server version error.

Can you help me to resolve this matter.

Regards to all
Samantha

By: Carl J

Carl J — Wed, 29 Jul 2009 11:01:08 +0000

Not a problem, glad I could help

By: Poonam

Poonam — Wed, 29 Jul 2009 10:42:25 +0000

Danilo Celic

Your solution worked for me. Thanks a lot

By: Carl J

Carl J — Mon, 06 Apr 2009 13:00:52 +0000

Hi Gary, the problem that you’re experiencing, is the same problem that I was having above. What may work (and I can’t test from here right) is to change your Rnd() in the ORDER BY, and use a random number instead of the Camp_Id, which the Id never changes. Instead you could generate a random number (or use Ticks) in ASP and use that.
“ORDER BY Rnd(Campaign.Camp_ID)” becomes “ORDER BY Rnd(” & RandomASPGeneratedNumber &”)”
Basically, to create a random number, you need a random number

By: Gary

Gary — Mon, 06 Apr 2009 12:50:35 +0000

Im using access with a classic ASP front end…on MS Access the query works great:

SELECT TOP 1 Campaign.Camp_ID, Companies.AD_ID, Campaign.CampURL
FROM Companies INNER JOIN (Campaign INNER JOIN CampStats ON Campaign.Camp_ID = CampStats.CampaignID) ON Companies.AD_ID = Campaign.Co_Parent
WHERE (((Campaign.CampActive)=’Yes’))
ORDER BY Rnd(Campaign.Camp_ID);

When this is ran through my ASP code, I get the same freaking ad every single time…it’s the ad with the highest Camp_ID though..

thoughts?

By: Eduard Gamonal » Blog Archive » What «random» means in Microsoft

Eduard Gamonal » Blog Archive » What «random» means in Microsoft — Tue, 10 Mar 2009 18:26:21 +0000

[...] it didn’t. I tried a few more lines, with no success. In CarlJ.ca I got an [...]

By: carlj

carlj — Fri, 05 Dec 2008 02:39:18 +0000

Hey JWhite,

Thanks for the link. I’ll try it out (not that I don’t believe the article) as soon as I can. I’ve been wanting to get around to doing an update on Access, with something similar.

By: jwhite

jwhite — Fri, 05 Dec 2008 01:21:16 +0000

For MS Access, see: http://www.databasedev.co.uk/random_query.html

By: Nate

Nate — Sat, 06 Sep 2008 10:22:10 +0000

Awesome… thank you for this very detailed description.

By: Carl J » This Day in History: September 2, 2008

Carl J » This Day in History: September 2, 2008 — Thu, 04 Sep 2008 23:59:37 +0000

[...] Selecting Random Records with SQL [...]

By: Will

Will — Fri, 29 Aug 2008 08:43:41 +0000

I’m considering using this for random pagination (on Postgres):

SELECT *
FROM records
ORDER BY (recordID % 5)

In the above query 5 would either be the hour or day, so the records would be in a different order every hour or day. The drawbacks are obviously it’s not frequent randomisation and if a user is paging just before the changeover of hour or day, they will probably see duplicate records.

By: Carl J

Carl J — Mon, 18 Aug 2008 10:27:53 +0000

Hey Tim,

That would be a bit difficult to do, because everytime you ask SQL for a new page, you’re asking it to select a page of random records. So whats going to stop page 2 from having some of the same records as page 1?

Now, if you want to sort the records randomly, then page through that list, then thats a different story.