我有一个访问管理系统的访问日志表，如下所示：
ID LogDate EmployeeId Direction
242 2014-05-02 07:59:20.000 2565 in
1907 2014-05-02 19:00:01.000 2565 out
3648 2014-05-03 08:08:03.000 2565 in
5611 2014-05-03 19:32:37.000 2565 out
5612 2014-05-03 19:33:44.000 2565 out
7315 2014-05-05 08:01:01.000 2565 in
9301 2014-05-05 19:37:48.000 2565 out
10857 2014-05-06 08:29:44.000 2565 in
12327 2014-05-06 18:51:56.000 2565 out
14331 2014-05-07 08:44:03.000 2565 in
16084 2014-05-07 19:09:07.000 2565 out
17608 2014-05-08 07:58:13.000 2565 in
21155 2014-05-09 08:12:26.000 2565 in
22673 2014-05-09 18:42:55.000 2565 out
24550 2014-05-10 08:13:09.000 2565 in
26455 2014-05-10 19:02:28.000 2565 out
30013 2014-05-12 19:07:53.000 2565 out
31083 2014-05-13 08:00:27.000 2565 in
31087 2014-05-13 08:02:39.000 2565 in
33084 2014-05-13 18:58:09.000 2565 out
35201 2014-05-14 08:31:13.000 2565 in
37238 2014-05-14 19:10:03.000 2565 out
39225 2014-05-15 08:47:44.000 2565 in
40636 2014-05-15 18:59:47.000 2565 out
42969 2014-05-16 09:58:17.000 2565 in
42970 2014-05-16 09:58:24.000 2565 in
42974 2014-05-16 09:58:51.000 2565 in
44114 2014-05-16 18:49:39.000 2565 out
44116 2014-05-16 18:50:43.000 2565 out
46284 2014-05-17 09:07:03.000 2565 in
47323 2014-05-17 17:56:57.000 2565 out
48719 2014-05-19 08:05:28.000 2565 in
49919 2014-05-19 18:52:35.000 2565 out
51188 2014-05-20 09:02:07.000 2565 in
52348 2014-05-20 19:01:05.000 2565 out
54231 2014-05-21 09:35:49.000 2565 in
55896 2014-05-21 19:57:48.000 2565 out
我有以下条件来获取样本12小时班次日志详细信息的持续时间：
注意：这是12小时轮班，请注意，当2014年7月20日19:00:00有一个进入时，可能会发生在2014年7月21日07:05:00和持续时间是12:05:00。
我写过Sqls来获得结果，但我无法处理某些条件： 这是test data：
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tmpAccessLogTbl]') AND type in (N'U'))
DROP TABLE [dbo].[tmpAccessLogTbl]
GO
CREATE TABLE tmpAccessLogTbl (
[ID] [int] NOT NULL PRIMARY KEY,
[LogDate] [datetime] NOT NULL,
[EmployeeId] [int] NOT NULL,
[Direction] [nvarchar](3) NULL
)
;
INSERT INTO tmpAccessLogTbl ([ID], [LogDate], [EmployeeId], [Direction])
SELECT 242, '20140502 07:59:20.000', 2565, N'in' UNION ALL
SELECT 1907, '20140502 19:00:01.000', 2565, N'out' UNION ALL
SELECT 3648, '20140503 08:08:03.000', 2565, N'in' UNION ALL
SELECT 5611, '20140503 19:32:37.000', 2565, N'out' UNION ALL
SELECT 5612, '20140503 19:33:44.000', 2565, N'out' UNION ALL
SELECT 7315, '20140505 08:01:01.000', 2565, N'in' UNION ALL
SELECT 9301, '20140505 19:37:48.000', 2565, N'out' UNION ALL
SELECT 10857, '20140506 08:29:44.000', 2565, N'in' UNION ALL
SELECT 12327, '20140506 18:51:56.000', 2565, N'out' UNION ALL
SELECT 14331, '20140507 08:44:03.000', 2565, N'in' UNION ALL
SELECT 16084, '20140507 19:09:07.000', 2565, N'out' UNION ALL
SELECT 17608, '20140508 07:58:13.000', 2565, N'in' UNION ALL
SELECT 21155, '20140509 08:12:26.000', 2565, N'in' UNION ALL
SELECT 22673, '20140509 18:42:55.000', 2565, N'out' UNION ALL
SELECT 24550, '20140510 08:13:09.000', 2565, N'in' UNION ALL
SELECT 26455, '20140510 19:02:28.000', 2565, N'out' UNION ALL
SELECT 30013, '20140512 19:07:53.000', 2565, N'out' UNION ALL
SELECT 31083, '20140513 08:00:27.000', 2565, N'in' UNION ALL
SELECT 31087, '20140513 08:02:39.000', 2565, N'in' UNION ALL
SELECT 33084, '20140513 18:58:09.000', 2565, N'out' UNION ALL
SELECT 35201, '20140514 08:31:13.000', 2565, N'in' UNION ALL
SELECT 37238, '20140514 19:10:03.000', 2565, N'out' UNION ALL
SELECT 39225, '20140515 08:47:44.000', 2565, N'in' UNION ALL
SELECT 40636, '20140515 18:59:47.000', 2565, N'out' UNION ALL
SELECT 42969, '20140516 09:58:17.000', 2565, N'in' UNION ALL
SELECT 42970, '20140516 09:58:24.000', 2565, N'in' UNION ALL
SELECT 42974, '20140516 09:58:51.000', 2565, N'in' UNION ALL
SELECT 44114, '20140516 18:49:39.000', 2565, N'out' UNION ALL
SELECT 44116, '20140516 18:50:43.000', 2565, N'out' UNION ALL
SELECT 46284, '20140517 09:07:03.000', 2565, N'in' UNION ALL
SELECT 47323, '20140517 17:56:57.000', 2565, N'out'
;
SELECT t.EmployeeId,
t.AttendanceDate,
t.InTime,
CASE
WHEN DATEDIFF(HOUR, t.InTime, t.OutTime) > 23 THEN NULL
ELSE t.OutTime
END AS OutTime,
CAST (DATEDIFF(HOUR, t.InTime, t.OutTime) AS VARCHAR) + ':' + CAST(DATEDIFF(minute, t.InTime, t.OutTime) %60 AS VARCHAR) AS Duration
FROM (
SELECT i.EmployeeId,
CONVERT(VARCHAR, i.LogDate, 106) AS AttendanceDate,
i.LogDate AS InTime,
(
SELECT MIN(o.LogDate) AS OutTime
FROM tmpAccessLogTbl o
WHERE o.Direction = 'Out'
AND o.EmployeeId = i.EmployeeId
AND o.LogDate > i.LogDate
) AS OutTime
FROM tmpAccessLogTbl i
WHERE i.Direction = 'In'
) AS t
ORDER BY
t.EmployeeId,
t.AttendanceDate
我的结果如下：这个Sql：
EmployeeId AttendanceDate InTime OutTime Duration
2565 02 May 2014 2014-05-02 07:59:20.000 2014-05-02 19:00:01.000 12:1
2565 03 May 2014 2014-05-03 08:08:03.000 2014-05-03 19:32:37.000 11:24
2565 05 May 2014 2014-05-05 08:01:01.000 2014-05-05 19:37:48.000 11:36
2565 06 May 2014 2014-05-06 08:29:44.000 2014-05-06 18:51:56.000 10:22
2565 07 May 2014 2014-05-07 08:44:03.000 2014-05-07 19:09:07.000 11:25
2565 08 May 2014 2014-05-08 07:58:13.000 NULL 35:44
2565 09 May 2014 2014-05-09 08:12:26.000 2014-05-09 18:42:55.000 10:30
2565 10 May 2014 2014-05-10 08:13:09.000 2014-05-10 19:02:28.000 11:49
2565 13 May 2014 2014-05-13 08:00:27.000 2014-05-13 18:58:09.000 10:58
2565 13 May 2014 2014-05-13 08:02:39.000 2014-05-13 18:58:09.000 10:56
2565 14 May 2014 2014-05-14 08:31:13.000 2014-05-14 19:10:03.000 11:39
2565 15 May 2014 2014-05-15 08:47:44.000 2014-05-15 18:59:47.000 10:12
2565 16 May 2014 2014-05-16 09:58:17.000 2014-05-16 18:49:39.000 9:51
2565 16 May 2014 2014-05-16 09:58:24.000 2014-05-16 18:49:39.000 9:51
2565 16 May 2014 2014-05-16 09:58:51.000 2014-05-16 18:49:39.000 9:51
2565 17 May 2014 2014-05-17 09:07:03.000 2014-05-17 17:56:57.000 8:49
总结一下，我将把上面的Sql和预期结果的结果放在这里：
-- My Current Query -- -- Expected Results --
Sl EmpID Day InTime OutTime Duration InTime OutTime Duration
1 2565 02-May-2014 7:59 19:00 11:00:41 7:59 19:00 11:00:41
2 2565 03-May-2014 8:08 19:32 11:24:34 8:08 19:32 11:24:34
3 2565 05 May 2014 8:01 19:37 11:36:47 8:01 19:37 11:36:47
4 2565 06 May 2014 8:29 18:51 10:22:12 8:29 18:51 10:22:12
5 2565 07 May 2014 8:44 19:09 10:25:04 8:44 19:09 10:25:04
6 2565 08 May 2014 7:58 NULL NULL 7:58 12:00:00
7 2565 09 May 2014 8:12 18:42 10:30:29 8:12 18:42 10:30:29
8 2565 10 May 2014 8:13 19:02 10:49:19 8:13 19:02 10:49:19
9 2565 13 May 2014 8:00 18:58 10:57:42
10 2565 13 May 2014 8:02 18:58 10:55:30 8:02 18:58 10:55:30
11 2565 14 May 2014 8:31 19:10 10:38:50 8:31 19:10 10:38:50
12 2565 15 May 2014 8:47 18:59 10:12:03 8:47 18:59 10:12:03
13 2565 16 May 2014 9:58 18:49 8:51:22
14 2565 16 May 2014 9:58 18:49 8:51:15
15 2565 16 May 2014 9:58 18:49 8:50:48 9:58 18:49 8:50:48
16 2565 17 May 2014 9:07 17:56 8:49:54 9:07 17:56 8:49:54
在预期结果中，每当没有相应的输出时间时，持续时间应为12:00:00。
请帮助我实现这一目标。 提前谢谢。
答案 0 :(得分：0)
如果您的代码唯一的问题是输出中具有NULL OutTime值的行应该具有12:00:00的持续时间，则以下代码应该适合您。
我所做的是将OutTime字段计算中使用的CASE语句逻辑添加到用于生成持续时间字段的字符串中。在ISNULL（）函数中包装该计算意味着具有太长持续时间的那些值将返回您想要的任何值。
SELECT t.EmployeeId,
t.AttendanceDate,
t.InTime,
CASE
WHEN DATEDIFF(HOUR, t.InTime, t.OutTime) > 23 THEN NULL
ELSE t.OutTime
END AS OutTime,
ISNULL(CAST (
DATEDIFF
(
HOUR,
t.InTime,
CASE
WHEN DATEDIFF(HOUR, t.InTime, t.OutTime) > 23
THEN NULL
ELSE t.OutTime
END) AS VARCHAR)
+ ':'
+ CAST(
DATEDIFF
(
minute,
t.InTime,
CASE
WHEN DATEDIFF(HOUR, t.InTime, t.OutTime) > 23
THEN NULL
ELSE t.OutTime
END
) %60 AS VARCHAR), '12:00') AS Duration
FROM (
SELECT i.EmployeeId,
CONVERT(VARCHAR, i.LogDate, 106) AS AttendanceDate,
i.LogDate AS InTime,
(
SELECT MIN(o.LogDate) AS OutTime
FROM tmpAccessLogTbl o
WHERE o.Direction = 'Out'
AND o.EmployeeId = i.EmployeeId
AND o.LogDate > i.LogDate
) AS OutTime
FROM tmpAccessLogTbl i
WHERE i.Direction = 'In'
) AS t
ORDER BY
t.EmployeeId,
t.AttendanceDate