sum Data from column 1 where falls between range in column 2 - oracle

Question

I'm fairly new to PL-SQL so could use a bit of help.
Table#1 contains:
LoanIntersestRates
------------------
4.5
4.0
3.5
3.0
2.5
Table #2 Contains:
ActualInterestRate LoanAmt
-----------------------------
4.6 356258.00
4.7 387958.25
2.6 485658.25
3.65 500562.00
4.1 434135.25
2.65 756254.02
4.5 286325.02
What I need to do is get a sum of the loanAmt where the ActualInterestRate is Exactly what is in table one.
Also, Need to sum up the loadAmts where the actualInterestrate is 1-50 points above each of the LoanInterestRates, 50-100 points above each of the LoanInterestRates and 100+ points above each of the LoanInterestRates.
Any help on this would be greatly appreciated. Thanks in advance!

Answer 1

Use the following query if you want to get the sum for rates mentioned in table 1
select lr.interest,sum(amount) from loaninterestrates lr, loaninterestamounts la
where lr.interest = la.interest
group by lr.interest
For step - 2 to find the sum for ranges use this
select la1.intrange,sum(la1.amount)from
(
select la.interest,la.amount,case when Remainder(la.interest*10,10) < 0 or Remainder(la.interest*10,10) = 5
then to_char(FLOOR(la.interest) + 0.5) || '-' || to_char(FLOOR(la.interest) + 1.0)
else to_char(FLOOR(la.interest)) || '-' || to_char(FLOOR(la.interest) + 0.5 )
end as intrange
from loaninterestamounts la
) la1
group by la1.intrange
sqlfiddle here: http://sqlfiddle.com/#!4/92f15/8

Answer 2

hi I have some misunderstanding your question but please check my sql
with t1 as
(select 4.5 as lir
from dual
union all
select 4.0
from dual
union all
select 3.5
from dual
union all
select 3.0
from dual
union all
select 2.5 from dual),
t2 as
(select 4.6 as air, 356258.00 as la
from dual
union all
select 4.7, 387958.25
from dual
union all
select 2.6, 485658.25
from dual
union all
select 3.65, 500562.00
from dual
union all
select 4.1, 434135.25
from dual
union all
select 2.65, 756254.02
from dual
union all
select 4.5, 286325.02 from dual),
t1_d as
(select lir as lir_low, lead(lir) over(order by lir) as lir_high from t1)
select t1_d.lir_low, sum(la) as sum_la
from t1_d, t2
where t2.air >= t1_d.lir_low
and ((t2.air < t1_d.lir_high) or (t1_d.lir_high is null))
group by t1_d.lir_low