running total max value by group

Question

running total max value by group

Talvin Singh

Ten Centuries

Points: 1288
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February 15, 2018 at 1:45 pm

#343607

Hi all,
i want a running total but with 2 clauses for the counter, the counter restarts when the total is 10, and it restarts to 1 when a new group starts:
ID Value Ref 1 4 1 1 4 1 1 8 2 1 10 3 2 5 1 2 5 1 3 1 1 3 5 1 3 5 2 3 6 3
as you can see above the Ref column increments when goes over 10, but also resets when there is a new ID.
the Value column will be in ascending order for each group.
SELECT * INTO #TestTable FROM (VALUES (1, 4) ,(1,4) ,(1, 8) ,(1,10) ,(2,5) ,(2,5) ,(3,1) ,(3,5) ,(3,5) ,(3,6) )v([ID],[Value]);

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Luis Cazares SSC Guru Points: 183698 More actions · Answer 1

Why is this different from your previous post?
https://www.sqlservercentral.com/Forums/1922239/Increament-id-if-running-total-for-group-exceeds-value

Luis C.
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Talvin Singh Ten Centuries Points: 1288 More actions · Answer 2

Luis Cazares - Thursday, February 15, 2018 1:52 PM
Why is this different from your previous post?
https://www.sqlservercentral.com/Forums/1922239/Increament-id-if-running-total-for-group-exceeds-value

Similar but I need the basket ID to restart. I have played around with that code but not getting it to work

Jeff Moden SSC Guru Points: 1003857 More actions · Answer 3

Talvin Singh - Thursday, February 15, 2018 2:00 PM
Luis Cazares - Thursday, February 15, 2018 1:52 PM
Why is this different from your previous post?
https://www.sqlservercentral.com/Forums/1922239/Increament-id-if-running-total-for-group-exceeds-value
Similar but I need the basket ID to restart. I have played around with that code but not getting it to work

There is nothing in your table to guarantee the processing order within an ID. Without such a thing, this is doomed to failure.

If the goal is to process in order by both the ascending order of both the ID and the Value, then such a thing can be done quite easily but if you're trying for something like load balancing, then that won't work.

What is this for? Load Balancing? Packing Boxes/Bins? Assigning tasks by duration? What?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

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