Also, if you give @RunningTotal an initial value of 0 instead of null you could remove the case expression.
...
DECLARE @DtBegin datetime,@DtEnd date,@dtDif int,@RunningTotal int = 0
...
UPDATE #QuirkUpdate
SET @RunningTotal = value =@RunningTotal + value
FROM #QuirkUpdate WITH (TABLOCKX) OPTION (MAXDOP 1) -- Nao remover o MAXDOP, pode quebrar o codigo
...
Same results just slightly easier to read.
Nice job with your code and thanks for posting back the results.
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