Retrieve the list of data from database using hibernate criteria - spring

Question

I have a table called employee_comp_field, where salary fields are available
comp_field id | year_id | compensation_field
1 101 salary
2 101 bonus
3 101 pf
4 101 allowance
5 102 salary
6 102 bonus
7 102 pf
8 102 allowance
Then I have another table where employee salary data get stored emp_compensation against each field. As you can see emp_id 10 has three set of records as he got three time salary hike in the same year(year_id=101), which can be identified by salary_order field.
id | year_id | emp_id | comp_field_id | amount | comp_order
1 101 10 1 10000 1
2 101 10 2 1000 1
3 101 10 3 1000 1
4 101 10 4 100 1
5 101 10 1 12000 2
6 101 10 2 100 2
7 101 10 3 10000 2
8 101 10 4 10000 2
9 101 10 1 15000 3
10 101 10 2 500 3
11 101 10 3 150 3
12 101 10 4 1500 3
13 101 11 1 13000 1
14 101 11 2 1300 1
15 101 11 3 null 1
16 101 11 4 150 1
I want to identify all the employees list with max salary_order
my desire output will be below:
id | year_id | emp_id | comp_field_id | amount | comp_order
9 101 10 1 15000 3
10 101 10 2 500 3
11 101 10 3 150 3
12 101 10 4 1500 3
13 101 11 1 13000 1
14 101 11 2 1300 1
15 101 11 3 null 1
16 101 11 4 150 1
as emp_id 10 got three time salary hike...so I retrieve the list of records with salary_order 3
and emp_id 11 got one ony so I retrieve that set of records ony with salary_order 1
Can someone please help me here, how to retrieve my desire output using hibernate criteria.
My thought is to first retrieve all the list based on emp_id and then using java stream if we can filter it out to get the desired output.
Please suggest the best possible way.

Answer 1

The best possible way.
is subjective. It can be the fastest, it can be the shortest. It could be anything.
I will give you an example of how you could build a query in mysql to replicate your output. This might be tricky to solve with Criteria though since the table is being self joined.
select a.*
from emp_compensation a
left outer join emp_compensation b on a.emp_id = b.emp_id
and a.comp_field_id = b.comp_field_id
and a.comp_order < b.comp_order
where b.emp_id is null