mysql - [My]SQL Query Syntax which requires foreach processing -


i have sql query task can ok in c# or linqpad prefer in sql standard reporting tools can it.

end db bugzilla under mysql

the problem need loop through bug_activity looking particular changes consider parent record "valid", how ? e.g. pseudo logic 

  if bug_status went in backlog   bug_status went assigned    , happened 2016-03-01 206-03-31    consider valid record

i unsure how web examples show declare , loops how loop fits "select, from, where" code.

set @bugid = 64252;  select      bugs_activity.bug_id, --   profiles.realname, --   profiles.login_name,      bugs_activity.bug_when,      fielddefs.name,       bugs_activity.added --   bugs_activity.removed      bugs_activity,      profiles,      fielddefs  -- real world 'where xx' have more logic , result in number of bugzilla records  -- each bugzilla record has own 'bugs_activity' -- logic needs @ each buzilla records historyto filter results  -- want end filtered record set , total number of records  bug_id = @bugid , bugs_activity.who = profiles.userid , bugs_activity.fieldid = fielddefs.id

example of bug_activity

bug_id bug_when name added 64252 26/01/2016 6:51:30 status_whiteboard id:103138574  64252 26/01/2016 6:52:10 cc xxx@abc.com  64252 28/01/2016 9:49:10 bug_status in backlog  64252 28/01/2016 9:49:10 cf_escalation_notes effort: 2 reproduced support  64252 28/01/2016 9:49:10 assigned_to def@abc.com  64252 2/05/2016 4:33:05 pm bug_status assigned  

select    bug_id,   sum(case when bug_status='in backlog' 1 else 0 end) backlogcount,   sum(case when bug_status='assigned' 1 else 0 end) assignedcount bugs_activity action_date between '2016-03-01' , '206-03-31' group bug_id having backlogcount>0 , assignedcount>0

the select returns bug_ids in 'in backlog' , in 'assigned' statuses during period. can use query above in section instead of bugs_activity

update:

add in select section

  max(case when bug_status='in backlog' action_date else null end) backlogdate,   max(case when bug_status='assigned' action_date else null end) assigneddate

and in having section and backlogdate<assigneddate


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