| Welcome to WebmasterWorld Guest from 18.104.22.168 |
register, free tools, login, search, subscribe, help, library, announcements, recent posts, open posts,
|Accredited PayPal World Seller|
|Help with DELETE statement|
| 3:19 am on Jun 1, 2007 (gmt 0)|
Hi, I have a table in which items are added with a timestamp constantly. I need to delete * elements and leave on the table only the most recent 50 items.
How can I do that in a single and efficient statement? Thanks!
| 10:54 pm on Jun 1, 2007 (gmt 0)|
DELETE FROM table T1 WHERE timestamp_col<=(SELECT MAX(timestamp_col) FROM table T2 WHERE (SELECT COUNT(*) FROM table T3 WHERE T3.timestamp_col<=T2.timestamp_col<=50))
May or may not work (probably won't as it's off the top of my head...)
Or maybe something like
DELETE FROM table WHERE timestamp_col NOT IN (SELECT timestamp_col FROM table ORDER BY timstamp_col DESC LIMIT 50)
All trademarks and copyrights held by respective owners. Member comments are owned by the poster.
© Webmaster World 1996-2014 all rights reserved