Question

Firstly i apologize for vague question title, i am not sure what to write there. Please let me know and i will update it.

Now here it goes..
I have 3

Table   : target
Columns : target_id , target_employee_id, target_location_id, target_location_name, target_scheduled_on, target_exec_end_time, target_damaged, target_damaged_text


Table   : employee  
Columns : employee_id, employee_manager_id

Table   : location
Columns : location_id, location_name

Little Explaination-> Managers role is to create a target for employee meaning a new target will have the location name and the scheduled on. Then employee will visit that location and report if there are any damages. This can happen multiple times in a month for same location.

What i need to show-> a list of targets having damages – between two dates (target_exec_end_time) and if there are multiple records of that same location then show the one having max date.

More Explaination-> There can be multiple entries of targets having same location but i need to show only one instance. target table image

I have tried my best to explain. Thanks in advance.

Answer 1

How about this:

 select * from target join employee on target.target_employee_id = employee.employee_id
     join location on target.target_location_name = location.location_name
     where target_exec_end_time between <start_date> and <end_date>
        and target_exec_end_time = (select max(target_exec_end_time) from location loc2
        where loc2.location_name = target.location_name)
     group by target.location_name;

Not sure about having both target_exec_end_time clauses in the where though. Maybe you just want the max value?