Select with multiple records
Greetings- I have a MySQL database with a table (job_table) containing information concerning jobs I run. Among the fields on the table are job_id (varchar(10)), and timestamp (a timestamp). As I run jobs, I add an entry to the table with the job_id, timestamp, and associated information, so the table contains multiple entries for any given job_id. I would like to be able to run a select on the table to retrieve the latest entry for each job_id so I can display a latest status message for every job. How do I (assuming that I can) construct the SELECT statement to do this? Thanks! Greg Lindstrom Acxiom Corporation,mail: CWY10011149 InfoBase Products Development office: (501) 342-1626 301 Industrial Blvd, Conway, AR, 72032 fax: (501) 336-3911 email: [EMAIL PROTECTED] Programming requires discipline. Period. If you're depending on a compiler to catch sloppy thinking, then you've got trouble. John Roth - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: Select with multiple records
can't you select the latest timestamp? On Wed, 12 Dec 2001, Lindstrom Greg - glinds wrote: Greetings- I have a MySQL database with a table (job_table) containing information concerning jobs I run. Among the fields on the table are job_id (varchar(10)), and timestamp (a timestamp). As I run jobs, I add an entry to the table with the job_id, timestamp, and associated information, so the table contains multiple entries for any given job_id. I would like to be able to run a select on the table to retrieve the latest entry for each job_id so I can display a latest status message for every job. How do I (assuming that I can) construct the SELECT statement to do this? Thanks! Greg Lindstrom Acxiom Corporation,mail: CWY10011149 InfoBase Products Development office: (501) 342-1626 301 Industrial Blvd, Conway, AR, 72032 fax: (501) 336-3911 email: [EMAIL PROTECTED] Programming requires discipline. Period. If you're depending on a compiler to catch sloppy thinking, then you've got trouble. John Roth - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: Select with multiple records
Greg, I have a MySQL database with a table (job_table) containing information concerning jobs I run. Among the fields on the table are job_id (varchar(10)), and timestamp (a timestamp). As I run jobs, I add an entry to the table with the job_id, timestamp, and associated information, so the table contains multiple entries for any given job_id. I would like to be able to run a select on the table to retrieve the latest entry for each job_id so I can display a latest status message for every job. How do I (assuming that I can) construct the SELECT statement to do this? =it appears that what you want is to group the job table rows by job_id and then take the most recent row as defined by the timestamp field. =The function required to choose the 'latest' (highest number) timestamp is appropriately enough called MAXIMUM(). In order to get the count to apply to a particular set of job_id rows use the GROUP BY clause (of SELECT). =Please check out the online manual for syntax and wider explanations. =dn - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
