----- Original Message ----- From: "darren" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, June 28, 2004 11:42 AM Subject: select and update field in one query
> Hi all, > > I need to select the top 1000 records based on the "usage" field and update > the "checked" field to '1'. > > I am currently doing it in 2 statements; i.e. select first then update from > a MYSQL_ROW array. How do I do it in just a single statement? > If you are selecting the 1000 rows so that you can display them and then update them to keep your database up-to-date, you can't do both in one statement. A SELECT statement can only display data and an UPDATE can only update data; an UPDATE cannot display rows *and* change values on those rows. If you are selecting the rows simply so that you can update them but don't display them, the update should be straightforward if you are using a version of MySQL that supports subqueries (V4.1.x). Something like this: update my_table set checked = 1 where primary_key in (select primary_key from my_table where order by usage limit 1000) This query probably won't work as is; I'm not that fluent on MySQL's brand of SQL yet. Other posters on this group can help you fine tune it so that it works. Rhino -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]