sorry for my bad english. Performance As EBarr points out, there can be performance issues with any of the above. Which security measures make sense for a static web site? RAND() * MAX(ID) + ORDER BY ID Q1 is expected to cost N * log2(N), Q2 and Q3 are nearly constant. weblink
Would you like to answer one of these unanswered questions instead? What makes a good antioxidant? The RAND() doesn't work and the LIMIT isn't recognized, nor does the question ask to limit the results to one record. –LarsTech Apr 7 at 22:23 add a comment| protected by Thank You.
The result you see above is pretty typical. To give you a sense of how this scales, I'll give you two examples from a database I work with. by Barney on 09/15/2005 at 12:39:23 PM UTC If you have a table with many rows, you can make this query much faster. For your help.
This is the only method that works flawlessly here, across hundreds of millions of rows, in production, on mysql 5.0 in a myisam table in under 100msec. Link-only answers can become invalid if the linked page changes. –Gerald Versluis Jun 23 '15 at 7:09 add a comment| up vote 0 down vote To be efficient, and random, it Any help would be much appreciated Thanks Everyone Ali php mysql database share|improve this question asked Nov 10 '11 at 10:08 user1010914 416 If you have only one record Sqlite Order By Random BUUUT - i do know some thing who can answer ALL of YOUR questions: google.com by asdf on 08/01/2008 at 4:00:57 PM UTC I use this one in Oracle: select *
I recently stumbled across a post in the forums that led me to a better way to accomplish this. plz All Information in my mail address send to you. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed http://stackoverflow.com/questions/19412/how-to-request-a-random-row-in-sql i have a problem with some php that is not randomly selecting an ip.
by Azeem Michael on 11/11/2010 at 11:51:11 AM UTC Hi,How to find 3rd minimum salary from salary column in SQL by Anonymous on 11/24/2010 at 10:01:32 AM UTC Hi,How to find Order By Newid() In a small dataset I find that the same record as that just selected randomly can be randomly selected again. What is wrong in this arithmetic with looping? more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed
by someone on 04/07/2007 at 10:15:01 AM UTC Hi, I have a table with 2 colums, and I wanted to get all the records in a single row (My SQL). How to check whether a partition is mounted by UUID? Order By Random Mysql current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Order By Random Oracle i need it in oracle.
These complexities, combined with ORDER BY RAND() resulted in the query taking > 6 seconds to execute. http://philgiebler.com/order-by/sql-order-by-not-working-correctly.html Is there a class like Optional but for non-optionals? hope somebody could help me with these thanks in advance! Mysql 5 TutorialsThese method is nice, easier then trying to do random sorting using php. Build a string that will be used in another query, e.g. "WHERE id = 2 OR id = 32847 OR id = 94384 OR…" 5. Order By Random Redshift
When someone get's fancy they add that you should really wrap NewID() in CheckSum(), you know, for performance! You should avoid selecting large amounts of records in this set!You then order your X records by RAND() and limit 1.Not only have you randomly chosen your program logic number, but do you know how to select multiple random rows? check over here move the work into the application First idea: We can simplify the whole job if we calculate the ID beforehand in the application.
That gives me the first row in the recordset :-) by sfsdfsdfsdf on 07/12/2006 at 9:28:04 AM UTC For PostgreSQL this worked much better: SELECT * FROM table OFFSET RANDOM() LIMIT Sql Server Tablesample by Jake on 08/23/2007 at 1:25:50 PM UTC If you want random results in ACCESS simply add SORT BY RND(id) to your SQL. If you change the query to SELECT * FROM table WHERE RAND()>0.9 ORDER BY RAND() then you've reduced the overhead of the sort by 90%.
There's a small difference, and most of the time the difference doesn't matter. –mrdenny Jan 28 '11 at 18:26 3 From a performance point of view, this is quite slow You might want to follow up to this topic!?! I don't know if it is "pure SQL", because it uses a variable in the TOP, but it works in SQL Server 2008. Sql Query To Select Random Records Kindly help..
Yikes! more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed by shivakumar on 09/03/2008 at 5:08:48 AM UTC Hello every one , plz help me i wana query for a the i have same records fourtime in the table so the this content I'm just finally catching up.
by web on 11/30/2009 at 6:51:00 AM UTC Order by rand is very slow. JOIN ( SELECT id, CAST(-2147483648 * RANDOM() AS integer) AS rand FROM tbl_post WHERE create_time >= 1349928000 ) r ON r.id = t.id WHERE create_time >= 1349928000 AND ... In older versions of SQL Server, you can use this: select top 1 * from mytable order by newid() In SQL Server 2005 and up, you can use TABLESAMPLE to get A cell is located in the fourth column and the fifth row.
Public blogs should not allow unfiltered public comments. by Raiku on 08/20/2008 at 2:15:57 PM UTC plz tell me the sql query for the record >2and=<6 ,the identical records select in a single row .