Nếu bạn muốn tạo tất cả DATETIME các giá trị trong khoảng thời gian [@StartDate, @EndDate] thì bạn có thể sử dụng bảng "kiểm đếm"
:
SET NOCOUNT ON
GO
-- DROP TABLE dbo.Numbers
CREATE TABLE dbo.Numbers (
Num INT IDENTITY(0,1),
CONSTRAINT PK_Numbers_Num PRIMARY KEY (Num)
);
GO
-- It generates all values from 0 to 9999
INSERT dbo.Numbers DEFAULT VALUES
GO 10000 -- You can insert more numbers if diff. between those two date/time values is greather than 13 days (I used a frecv. of 2 minutes to computes this maximum limit)
và sau đó là một SELECT đơn giản tuyên bố
DECLARE @StartDate DATETIME2(0), @EndDate DATETIME2(0), @Frequency TINYINT
SELECT @StartDate = '2015-04-17 11:00:00',
@EndDate = '2015-04-17 11:15:00',
@Frequency = 2; -- Minutes
SELECT n.Num,
DATEADD(MINUTE, n.Num*@Frequency, @StartDate) AS RangeStart
/*,
CASE
WHEN DATEADD(MINUTE, (n.Num + 1)*@Frequency, @StartDate) > @EndDate
THEN @EndDate
ELSE DATEADD(MINUTE, (n.Num + 1)*@Frequency, @StartDate)
END AS RangeEnd
*/
FROM dbo.Numbers n
WHERE n.Num <= DATEDIFF(MINUTE, @StartDate, @EndDate) / @Frequency
/*
Num RangeStart RangeEnd
----------- --------------------------- ---------------------------
0 2015-04-17 11:00:00 2015-04-17 11:02:00
1 2015-04-17 11:02:00 2015-04-17 11:04:00
2 2015-04-17 11:04:00 2015-04-17 11:06:00
3 2015-04-17 11:06:00 2015-04-17 11:08:00
4 2015-04-17 11:08:00 2015-04-17 11:10:00
5 2015-04-17 11:10:00 2015-04-17 11:12:00
6 2015-04-17 11:12:00 2015-04-17 11:14:00
7 2015-04-17 11:14:00 2015-04-17 11:15:00
*/
