Question

我们有一个数据库，每分钟记录一次来自系统的数据

+---------+-------------------------+  
| Id      | EntryDate               |     
+---------+-------------------------+   
| 8093562 | 2019-05-17 15:01:25.000 |  
| 8093563 | 2019-05-17 15:02:25.000 |  
| 8093564 | 2019-05-17 15:03:25.000 |  
| 8093565 | 2019-05-17 15:04:25.000 |  
| 8093566 | 2019-05-17 15:05:25.000 |  
| 8093568 | 2019-05-17 15:07:25.000 |  
| 8093569 | 2019-05-17 15:08:25.000 |  
| 8093780 | 2019-05-17 15:09:25.000 |  
| 8093781 | 2019-05-17 15:10:25.000 |  
+---------+-------------------------+

我正在尝试进行查询，以查找分钟之间是否有间隔。例如，在上述数据中，缺少15:06的数据。

无法确定如何在SQL查询中执行此操作。

Answer 1

将LEAD()与CASE结合使用，可以获得预期的结果：

SELECT ResultDate FROM (
    SELECT CASE WHEN (DATEDIFF(MINUTE, LEAD(EntryDate, 1) OVER(ORDER BY EntryDate),EntryDate) < -1) THEN DATEADD(MINUTE, +1, EntryDate) END AS ResultDate
    FROM TableName
) Q WHERE ResultDate IS NOT NULL

具有给定样本数据的演示：

DECLARE  @TestTable TABLE (Id INT, EntryDate DATETIME);

INSERT INTO @TestTable (Id, EntryDate) VALUES  
(8093562, '2019-05-17 15:01:25.000'),
(8093563, '2019-05-17 15:02:25.000'),
(8093564, '2019-05-17 15:03:25.000'),
(8093565, '2019-05-17 15:04:25.000'),
(8093566, '2019-05-17 15:05:25.000'),
(8093568, '2019-05-17 15:07:25.000'),
(8093569, '2019-05-17 15:08:25.000'),
(8093780, '2019-05-17 15:09:25.000'),
(8093781, '2019-05-17 15:10:25.000');

SELECT ResultDate FROM (
    SELECT CASE WHEN (DATEDIFF(MINUTE, LEAD(EntryDate, 1) OVER(ORDER BY EntryDate),EntryDate) < -1) THEN DATEADD(MINUTE, +1, EntryDate) END AS ResultDate
    FROM @TestTable
) Q WHERE ResultDate IS NOT NULL

输出：

ResultDate
-----------------------
2019-05-17 15:06:25.000

Demo on db<>fiddle

T-SQL-每分钟检查日期时间数据中的间隔

1 个答案: