Selecting just 'N' first rows
Hello How can I send a query that retrieves only the first 'N' rows that match a condition? As far as I know you must call mysql_fetch_row() until the last row has been processed or the resources allocated won't be free. Am creating a program in PHP that should retrieve only 'N' records each time a query is sent, so I I'm thinking on using mysql_free_result(), but, is it safe to free the results even if there are more records remaining that match the query conditions? I need to know how secure could be to read only the first records and free the resources, or if there is another way to do the same thing. Thanks, Miguel -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Selecting just 'N' first rows
Look up the LIMIT clause of SELECT statement, also ASCENDING/DESCENDING - depending on how you want it. Remember LIMIT can take a number and an offset. Terry - Original Message - *From:* Renito 73 [EMAIL PROTECTED] *To:* mysql@lists.mysql.com *Date:* Sun, 9 Sep 2007 10:05:52 -0500 Hello How can I send a query that retrieves only the first 'N' rows that match a condition? As far as I know you must call mysql_fetch_row() until the last row has been processed or the resources allocated won't be free. Am creating a program in PHP that should retrieve only 'N' records each time a query is sent, so I I'm thinking on using mysql_free_result(), but, is it safe to free the results even if there are more records remaining that match the query conditions? I need to know how secure could be to read only the first records and free the resources, or if there is another way to do the same thing. Thanks, Miguel -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED] -- No virus found in this incoming message. Checked by AVG. Version: 7.5.485 / Virus Database: 269.13.10/995 - Release Date: 08/09/2007 13:24 Terry http://booksihaveread.awardspace.co.uk -- No virus found in this outgoing message. Checked by AVG. Version: 7.5.485 / Virus Database: 269.13.10/995 - Release Date: 08/09/2007 13:24 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Selecting just 'N' first rows
How can I send a query that retrieves only the first 'N' rows that match a condition? As far as I know you must call mysql_fetch_row() until the last row has been processed or the resources allocated won't be free. Am creating a program in PHP that should retrieve only 'N' records each time a query is sent, so I I'm thinking on using mysql_free_result(), but, is it safe to free the results even if there are more records remaining that match the query conditions? I need to know how secure could be to read only the first records and free the resources, or if there is another way to do the same thing. Why dont' you just use the LIMIT statement? thnx, Chris -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
