Asegúrese de que la columna de fecha tenga un índice y que el rendimiento sea razonable.
SELECT t.Date,
COUNT(*) AS Quantity,
(SELECT COUNT(*) FROM Table WHERE Date < t.Date) AS RunningTotal
FROM Table t
GROUP BY t.Date
Obtener una tabla llena con una fila por minuto se puede hacer extremadamente rápido de la siguiente manera:
DECLARE @StartDate smalldatetime
DECLARE @EndDate smalldatetime
SET @StartDate = '1 jan 2009' --MIN(TimeStamp) FROM Table
SET @EndDate = '2 jan 2009' --MAX(TimeStamp) FROM Table
SET @StartDate = DATEADD(minute,-DATEPART(minute,@StartDate),@StartDate)
SET @EndDate = DATEADD(minute,-DATEPART(minute,@EndDate),@EndDate)
; WITH DateIntervalsCTE AS
(
SELECT 0 i, @startdate AS Date
UNION ALL
SELECT i + 1, DATEADD(minute, i, @startdate )
FROM DateIntervalsCTE
WHERE DATEADD(minute, i, @startdate ) <= @enddate
)
SELECT DISTINCT Date FROM DateIntervalsCTE
OPTION (MAXRECURSION 32767);
Siempre que solo necesite <~22 días de datos debido a las restricciones de recurrencia.
Todo lo que necesita ahora es fusionar los dos, usar una tabla temporal para almacenar datos parece ser lo más rápido
DECLARE @StartDate smalldatetime
DECLARE @EndDate smalldatetime
DECLARE @t TABLE (Date smalldatetime,Quantity int,RunningTotal int)
SET @StartDate = '1 jan 2009' --MIN(TimeStamp) FROM Table
SET @EndDate = '2 jan 2009' --MAX(TimeStamp) FROM Table
SET @StartDate = DATEADD(minute,-DATEPART(minute,@StartDate),@StartDate)
SET @EndDate = DATEADD(minute,-DATEPART(minute,@EndDate),@EndDate)
; WITH DateIntervalsCTE AS
(
SELECT 0 i, @startdate AS Date
UNION ALL
SELECT i + 1, DATEADD(minute, i, @startdate )
FROM DateIntervalsCTE
WHERE DATEADD(minute, i, @startdate ) <= @enddate
)
INSERT INTO @t (Date)
SELECT DISTINCT Date FROM DateIntervalsCTE
OPTION (MAXRECURSION 32767);
UPDATE t SET Quantity = (SELECT COUNT(d.TimeStamp) FROM Table d WHERE Date = t.date)
from @t t
update t2 set runningtotal = (SELECT SUM(Quantity) FROM @t WHERE date <= t2.date)
from @t t2
select * from @t
