Get minimum value per user - sql

Question

I have this SQL code here, my wish is to calculate the latest fee balance per student for each deposit made. So far I have been able to achieve this but now the question is how I'm I to select only the latest balance while disregarding the other previous entries/Balances
(select
f.Totals -SUM(Total) OVER(ORDER BY pay_Id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) as Balance,
p.Total as 'TotalPaid',
c.class_id as 'ClassID',
p.std_ID as 'STDID',
c.class_name as 'Class',
a.ad_stdname as 'Name',
t.term_id as 'TermID',
t.term_name as 'Term',
p.Date as 'Date',
case when (st.str_id = null) then '-' else st.str_id end as 'StrID',
case when (p.Tution_fee = null) then '0' else p.Tution_fee end as 'Tution',
case when (p.adm_fee = null) then '0' else p.adm_fee end as 'Admission',
case when (p.Activity_fee = null) then '0' else p.Activity_fee end as 'Activity',
case when (p.Textbk_Statio = null) then '0' else p.Textbk_Statio end as 'Texbooks',
case when (p.Transport_fee = null) then '0' else p.Transport_fee end as 'Transport'
from Payments p
inner join Admissions a
on a.ad_id = p.std_ID
inner join classes c
on c.class_id =p.class_id
inner join fees f on f.fee_classID = p.class_id and f.Term_id = p.Term_id
left join streams st
on st.str_id = p.str_id
inner join terms t
on p.Term_id = t.term_id
where a.ad_id = 29
)
order by p.std_name,Balance,p.Date desc
This is my current output

Answer 1

I have selected min value for each user in below example:
user date value
Sonu 1/2/2010 1.5
Monu 1/3/2010 2.5
Arun 8/4/2009 3.5
Sonu 2/2/2010 1.0
Monu 12/2/2009 0.5
select t.username, t.date, t.value
from MyTable t
inner join (
select username, min(value) as value
from MyTable
group by username
) tm on t.username = tm.username and t.value = tm.value
Demo sql Fiddle
Use above logic to implement in your code
I tried to accommodate above logic in you query. for now i have just used stdid for grouping, you may add more accordingly. you might get some syntax error:
with MyTable as (select
f.Totals -SUM(Total) OVER(ORDER BY pay_Id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) as Balance,
p.Total as 'TotalPaid',
c.class_id as 'ClassID',
p.std_ID as 'STDID',
c.class_name as 'Class',
a.ad_stdname as 'Name',
t.term_id as 'TermID',
t.term_name as 'Term',
p.Date as 'Date',
case when (st.str_id = null) then '-' else st.str_id end as 'StrID',
case when (p.Tution_fee = null) then '0' else p.Tution_fee end as 'Tution',
case when (p.adm_fee = null) then '0' else p.adm_fee end as 'Admission',
case when (p.Activity_fee = null) then '0' else p.Activity_fee end as 'Activity',
case when (p.Textbk_Statio = null) then '0' else p.Textbk_Statio end as 'Texbooks',
case when (p.Transport_fee = null) then '0' else p.Transport_fee end as 'Transport'
from Payments p
inner join Admissions a
on a.ad_id = p.std_ID
inner join classes c
on c.class_id =p.class_id
inner join fees f on f.fee_classID = p.class_id and f.Term_id = p.Term_id
left join streams st
on st.str_id = p.str_id
inner join terms t
on p.Term_id = t.term_id
where a.ad_id = 29
order by p.std_name,Balance,p.Date desc) select * from MyTable
inner join
(
select STDID, min(Balance) as value
from MyTable
group by STDID
) tm on t.STDID = tm.STDID and t.Balance = tm.Balance