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id crdate num
----------------------------------------
1 2010-02-26 17:03:00.000 1
2 2010-02-26 17:03:02.000 3
3 2010-02-26 17:03:07.000 2
4 2010-02-26 17:03:09.000 3
5 2010-02-26 17:03:11.000 9
6 2010-02-26 17:03:20.000 2
7 2010-02-26 17:03:25.000 9
8 2010-02-26 17:03:28.000 6
9 2010-02-26 17:03:28.000 8
10 2010-02-26 17:03:28.000 8
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17:03:02.000~17:03:11.000
17:03:11.000~17:03:20.000
17:03:20.000~17:03:28.000
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SQL code
use tempdb
go
IF OBJECT_ID('[tb]') IS NOT NULL
DROP TABLE [tb]
go
CREATE TABLE [tb] (id INT,crdate DATETIME,num INT)
INSERT INTO [tb]
SELECT 1,'2010-02-26 17:03:00.000',1 UNION ALL
SELECT 2,'2010-02-26 17:03:02.000',3 UNION ALL
SELECT 3,'2010-02-26 17:03:07.000',2 UNION ALL
SELECT 4,'2010-
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