mysql - SQL Query for ID to filter against date -


basically have query returns data tracking tool. query is:

select `bh`.`bug_id`, `p`.`name` `project`, `p2`.`name` `portfolio`, `u`.`username` `user`,from_unixtime( `bh`.`date_modified` ) `modify_ts`,  case `b`.`category_id` when '0' 'no category' when '1' 'all projects general' when '185' '1. req - requirements' when '186' '2. des - design' when '180' '3. dev - development phase testing' when '181' '4. qat - quality assurance testing' when '182' '5. bat -experian business accecptance testing' when '183' '6. uat - external client user testing' when '184' '7. war - warranty period' when '223' '[mort phase 3] 8. defect density' else `b`.`category_id` end `category`, case `b`.`severity` when '40' 'cosmetic' when '50' 'minor' when '60' 'major' when '70' 'critical' end `severity`, case `b`.`priority`  when '20' 'low' when '30' 'medium' when '40' 'high' when '50' 'very high' end `priority`, case `b`.`resolution` when '10' 'open'  when '20' 'passed testing'  when '60' 'duplicate'  when '70' 'change request'  when '80' 'deferred'  when '90' 'rejected'  end `resolution`, case `b`.`status`  when '10' 'new'  when '20' 'clarification' when '40' 'fixed' when '50' 'open'  when '80' 'ready test'  when '90' 'closed'  end `status` `bugtracker`.`mantis_bug_history_table` `bh` left join `bugtracker`.`mantis_bug_table` `b` on `bh`.`bug_id` = `b`.`id` left join `bugtracker`.`mantis_user_table` `u` on `bh`.`user_id` = `u`.`id`  left join `bugtracker`.`mantis_project_table` `p` on `b`.`project_id` = `p`.`id`  left join `bugtracker`.`mantis_project_hierarchy_table` `ph` on `b`.`project_id` = `ph`.`child_id` left join `bugtracker`.`mantis_project_table` `p2` on `ph`.`parent_id` = `p2`.`id`

and example snippet of output columns removed is:

> 19213 triggers uat    14/08/2014 11:00    major   high   open    new 19213   triggers uat    14/08/2014 11:00    major   high   open    new 19213   triggers uat    14/08/2014 11:00    major   high   open    new 19213   triggers uat    04/08/2014 15:30    major   high   open    new 19213   triggers uat    04/08/2014 15:30    major   high   open    new 19394   triggers uat    15/08/2014 14:24    major   high    open    new 19394   triggers uat    15/08/2014 14:24    major   high    open    new 19394   triggers uat    14/08/2014 10:56    major   high    open    new 19394   triggers uat    14/08/2014 10:56    major   high    open    new 19432   triggers uat    15/08/2014 14:32    major   high    open    new 19432   triggers uat    15/08/2014 14:32    major   high    open    new

what want within query each id (far left column - bh.bug_id), return 1 latest date (3rd column - bh.`date_modified). can throw distinct on top of one's return same if need be.

is there way me filter query essentially?

implemted code added query above : 

from `bugtracker`.`mantis_bug_history_table` `bh` inner join (select `bh`.`bug_id`, max(`bh`.`date_modified`)as `md` `bugtracker`.`mantis_bug_history_table` `bh`  group `bh`.`bug_id`) `max_dates` on `bh`.`bug_id` = `max_dates`.`bug_id` , `bh`.`date_modified` = `max_dates`.`md` left join `bugtracker`.`mantis_bug_table` `b` on `bh`.`bug_id` = `b`.`id`

join max dates this:

select distinct ... `bugtracker`.`mantis_bug_history_table` `bh` inner join (select bug_id, max(date_modified) md mantis_bug_history_table group bug_id) max_dates on bh.bug_id = max_dates.bug_id , bh.date_modified = max_dates.md left join ...

for example , other ways solve this, here's excellent manual entry the rows holding group-wise maximum of column


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