I have problem that I find very hard to solve:
I need to calculate a column R_t in SQL where for each row, the sum of the "previous" calculated values SUM(R_t-1) is required as input. The calculation is done grouped over a ProjectID column. I have no clue how to proceed.
The formula for the calculation I am trying to achieve is R_t = ([Contract value]t - SUM(R{t-1})) / [Remaining Hours]_t * [HoursRegistered]t where "t" denotes time and SUM(R{t-1}) is the sum of R_t from t = 0 to t-1.
Time is always consecutive and always begin in t = 0. But number of time periods may differ across [ProjectID], i.e. one project having t = {0,1,2} and another t = {0,1,2,3,4,5}. The time period will never "jump" from 5 to 7
The expected output (using the data from below is) for ProjectID 101 is
R_0 = (500,000 - 0) / 500 * 65 = 65,000
R_1 = (500,000 - (65,000)) / 435 * 100 = 100,000
R_2 = (500,000 - (65,000 + 100,000)) / 335 * 85 = 85,000
R_3 = (500,000 - (65,000 + 100,000 + 85,000)) / 250 * 69 = 69,000
etc...
This calculation is done for each ProjectID.
My question is how to formulate this in a SQL query? My first thought was to create a recursive CTE, but I am actually not sure it is the right way proceed. Recursive CTE is (from my understanding) made for handling more of hierarchical like structure, which this isn't really.
My other thought was to calculate the SUM(R_t-1) using windowed functions, ie SUM OVER (PARITION BY ORDER BY) with a LAG, but the recursiveness really gives me trouble and I run my head against the wall when I am trying.
Below a query for creating the input data
CREATE TABLE [dbo].[InputForRecursiveCalculation]
(
[Time] int NULL,
ProjectID [int],
ContractValue float,
ContractHours float,
HoursRegistered float,
RemainingHours float
)
GO
INSERT INTO [dbo].[InputForRecursiveCalculation]
(
[Time]
,[ProjectID]
,[ContractValue]
,[ContractHours]
,[HoursRegistered]
,[RemainingHours]
)
VALUES
(0,101,500000,500,65,500),
(1,101,500000,500,100,435),
(2,101,500000,500,85,335),
(3,101,500000,500,69,250),
(4,101,450000,650,100,331),
(5,101,450000,650,80,231),
(6,101,450000,650,90,151),
(7,101,450000,650,45,61),
(8,101,450000,650,16,16),
(0,110,120000,90,10,90),
(1,110,120000,90,10,80),
(2,110,130000,90,10,70),
(3,110,130000,90,10,60),
(4,110,130000,90,10,50),
(5,110,130000,90,10,40),
(6,110,130000,90,10,30),
(7,110,130000,90,10,20),
(8,110,130000,90,10,10)
GO
For those of you who dare downloading something from a complete stranger, I have created an Excel file demonstrating the calculation (please download the file as you will not be to see the actual formula in the HTML representation shown when first clicking the link):
https://www.dropbox.com/s/3rxz72lbvooyc4y/Calculation%20example.xlsx?dl=0
Best regards,
Victor
I think it will be usefull for you. There is additional column SumR that stands for sumarry of previest rows (for ProjectID)
;with recu as
(
select
Time,
ProjectId,
ContractValue,
ContractHours,
HoursRegistered,
RemainingHours,
cast((ContractValue - 0)*HoursRegistered/RemainingHours as numeric(15,0)) as R,
cast((ContractValue - 0)*HoursRegistered/RemainingHours as numeric(15,0)) as SumR
from
InputForRecursiveCalculation
where
Time=0
union all
select
input.Time,
input.ProjectId,
input.ContractValue,
input.ContractHours,
input.HoursRegistered,
input.RemainingHours,
cast((input.ContractValue - prev.SumR)*input.HoursRegistered/input.RemainingHours as numeric(15,0)),
cast((input.ContractValue - prev.SumR)*input.HoursRegistered/input.RemainingHours + prev.SumR as numeric(15,0))
from
recu prev
inner join
InputForRecursiveCalculation input
on input.ProjectId = prev.ProjectId
and input.Time = prev.Time + 1
)
select
*
from
recu
order by
ProjectID,
Time
RESULTS:
Time ProjectId ContractValue ContractHours HoursRegistered RemainingHours R SumR
----------- ----------- ---------------------- ---------------------- ---------------------- ---------------------- --------------------------------------- ---------------------------------------
0 101 500000 500 65 500 65000 65000
1 101 500000 500 100 435 100000 165000
2 101 500000 500 85 335 85000 250000
3 101 500000 500 69 250 69000 319000
4 101 450000 650 100 331 39577 358577
5 101 450000 650 80 231 31662 390239
6 101 450000 650 90 151 35619 425858
7 101 450000 650 45 61 17810 443668
8 101 450000 650 16 16 6332 450000
0 110 120000 90 10 90 13333 13333
1 110 120000 90 10 80 13333 26666
2 110 130000 90 10 70 14762 41428
3 110 130000 90 10 60 14762 56190
4 110 130000 90 10 50 14762 70952
5 110 130000 90 10 40 14762 85714
6 110 130000 90 10 30 14762 100476
7 110 130000 90 10 20 14762 115238
8 110 130000 90 10 10 14762 130000
I'm looking to improve my code efficiency by turning my code into arrays and loops. The data i'm working with starts off like this:
ID Mapping Asset Fixed Performing Payment 2017 Payment2018 Payment2019 Payment2020
1 Loan1 1 1 1 90 30 30 30
2 Loan1 1 1 0 80 20 40 20
3 Loan1 1 0 1 60 40 10 10
4 Loan1 1 0 0 120 60 30 30
5 Loan2 ... ... ... ... ... ... ...
So For each ID (essentially the data sorted by Mapping, Asset, Fixed and then Performing) I'm looking to build a profile for the Payment Scheme.
The Payment Vector for the first ID looks like this:
PaymentVector1 PaymentVector2 PaymentVector3 PaymentVector4
1 0.33 0.33 0.33
It is represented by the formula
PaymentVector(I)=Payment(I)/Payment(1)
The above is fine to create in an array, example code can be given if you wish.
Next, under the assumption that every payment made is replaced i.e. when 30 is paid in 2018, it must be replaced, and so on.
I'm looking to make a profile that shows the outflows (and for illustration, but not required in code, in brackets inflows) for the movement of the payments as such - For ID=1:
Payment2017 Payment2018 Payment2019 Payment2020
17 (+90) -30 -30 -30
18 N/A (+30) -10 -10
19 N/A N/A (+40) -13.3
20 N/A N/A N/A (+53.3)
so if you're looking forwards, the rows can be thought of what year it is and the columns representing what years are coming up.
Hence, in year 2019, looking at what is to be paid in 2017 and 2018 is N/A because those payments are in the past / cannot be paid now.
As for in year 2018, looking at what has to be paid in 2019, you have to pay one-third of the money you have now, so -10.
I've been working to turn this dataset row by row into the array but there surely has to be a quicker way using an array:
The Code I've used so far looks like:
Data Want;
Set Have;
Array Vintage(2017:2020) Vintage2017-Vintage2020;
Array PaymentSchedule(2017:2020) PaymentSchedule2017-PaymentSchedule2020;
Array PaymentVector(2017:2020) PaymentVector2017-PaymentVector2020;
Array PaymentVolume(2017:2020) PaymentVolume2017-PaymentVolume2020;
do i=1 to 4;
PaymentVector(i)=PaymentSchedule(i)/PaymentSchedule(1);
end;
I'll add code tomorrow... but the code doesn't work regardless.
data have;
input
ID Mapping $ Asset Fixed Performing Payment2017 Payment2018 Payment2019 Payment2020; datalines;
1 Loan1 1 1 1 90 30 30 30
2 Loan1 1 1 0 80 20 40 20
3 Loan1 1 0 1 60 40 10 10
4 Loan1 1 0 0 120 60 30 30
data want(keep=id payment: fraction:);
set have;
array p payment:;
array fraction(4); * track constant fraction determined at start of profile;
array out(4); * track outlay for ith iteration;
* compute constant (over iterations) fraction for row;
do i = dim(p) to 1 by -1;
fraction(i) = p(i) / p(1);
end;
* reset to missing to allow for sum statement, which is <variable> + <expression>;
call missing(of out(*));
out(1) = p(1);
do iter = 1 to 4;
p(iter) = out(iter);
do i = iter+1 to dim(p);
p(i) = -fraction(i) * p(iter);
out(i) + (-p(i)); * <--- compute next iteration outlay with ye olde sum statement ;
end;
output;
p(iter) = .;
end;
format fract: best4. payment: 7.2;
run;
You've indexed your arrays with 2017:2020 but then try and use them using the 1 to 4 index. That won't work, you need to be consistent.
Array PaymentSchedule(2017:2020) PaymentSchedule2017-PaymentSchedule2020;
Array PaymentVector(2017:2020) PaymentVector2017-PaymentVector2020;
do i=2017 to 2020;
PaymentVector(i)=PaymentSchedule(i)/PaymentSchedule(2017);
end;
guys i have problem with one old SP which calculates total days late when the costumer is late with the payments of an instalment
it goes like this:
#total days paid# #1st inst days due# #2nd inst days due# #total days#
---------------------------------------------------------------------------
---------------------------------------------------------------------------
0 1 0 1
0 2 0 2
0 3 0 3
0 4 0 4
0 30 0 30
0 31 1 31
0 32 2 32
32 0 3 35
so the procedure calculates (total days paid) + max of the days due
0+32 =32
32+3 =35
etc
and makes mistakes whenever the costumer is latemore then 30 days
its should always increment by 1 and not overlap the calculations
can anyone think of a quick way to fix this without over writhing the whole thing
so you have an existing formula for calculating #total days#, if you can locate the final place where that is returned, it could be a formula or a field name, let's call that (...) because we don't know what it is here, you can change it to
(...) + CASE WHEN (...) >= 30 THEN 1 ELSE 0 END AS '#total days#'
Speed A b c Total
129 11 4 2.75 354.75
91 9 6 1.5 136.5
166 19 8 2.375 395.08
164 26 12 2.16666666666667 355.88
146 11 6 1.83333333333333 267.18
147 16 8 2 294
201 8 3 2.66666666666667 536.67
164 4 2 2 328
186 8 6 1.33333333333333 247.38
165 7 4 1.75 288.75
171 10 4 2.5 427.5
104 5 4 1.25 130
1834 134 67 2 3668
Iam using total=Speed*c
But the value is not getting equal if i add all values for last column 1834 .I am getting 100 ampunt less.
The first:
Total = Speed * c, this expression about your output I suppose is rounded at the second number after comma.
The second:
You have put 2 as value of c in the last row. Why? This is the average of all previous rows?
So, if you take the forst and the second, you'll have cause about you have a difference with the last row and the other rows
Approximate-number data types for use with floating point numeric data.
Floating point data is approximate; therefore, not all values in the data
type range can be represented exactly.
Float has a default 15 digit precision. So when your number has more digits it will round off the rest of the digits.
You are showing total with only 2 decimals. You could consider permanently changing c to decimal(20,14). Here is the result if you convert it to decimal, this should be more exact:
select cast(c as decimal(20, 14)) * speed as Total
from table
for a table on ms-sql2000 containing the following columns and numbers:
S_idJ_id Se_id B_id Status Count multiply
63 1000 16 12 1 10 2
64 1001 12 16 1 9 3
65 1002 17 12 1 10 2
66 1003 16 12 1 6 3
67 1004 12 16 1 10 2
I want to generate an classic asp script which will do the following for each row
where status=1 :
-multiply -> answer= multiply column 'count' with column 'multiply'
Then:
count the total answer and sum for each se_id like :
se_id total
12 47
16 38
17 20
and display on screen like
Rank se_id total
1 12 47
2 16 38
3 17 20
Condition:
if there are multiple equal total values then give the lower numbered se_id a priority for
getting a ranking and give the next higher numbered se_id the next number in rank
Any sample code in classic asp or advice is welcome on how to get this accomplished
'score' = source table.
if (EXISTS (select * from INFORMATION_SCHEMA.TABLES where TABLE_NAME = 'result_table'))
begin
drop table result_table;
end
select
rank = IDENTITY(INT,1,1),
se_id, sum(multiply * count) as total
into result_table
from score
where status = 1
group by se_id
order by total desc, se_id;
[Edit] Change query as answer on first comment