我的查询
SELECT DATE, SEC_TO_TIME( SUM( TIME_TO_SEC( `total_hours` ) ) ) AS total
FROM work_details
WHERE `employee_id` = '28'
AND DATE
BETWEEN '2012-02-01'
AND '2012-02-29'
GROUP BY DATE
ORDER BY DATE
// 从数据库表 work_details 中获取给定员工在给定日期的总工作时间，total_hours 是时间类型。
结果
DATE total
2012-02-01 04:19:50
2012-02-02 07:38:21
2012-02-06 07:43:24
2012-02-07 07:21:36
2012-02-08 07:38:45
2012-02-09 06:05:22
2012-02-10 07:28:00
2012-02-13 07:37:38
2012-02-14 07:37:22
2012-02-15 07:35:10
2012-02-16 07:29:13
2012-02-17 07:07:23
2012-02-20 07:40:32
2012-02-21 07:43:32
2012-02-22 07:36:40
2012-02-23 07:37:57
2012-02-24 07:35:04
2012-02-27 09:54:02
2012-02-28 07:41:35
2012-02-29 04:01:11
我需要检索总工作时间小于4 小时的日期，以便我可以将这些天数计算为一半的假期。有什么帮助吗？？
我也试过这个查询，我给了 8 而不是 4，因为我的表现在不包含少于 4 的数据。
SELECT DATE, SEC_TO_TIME( SUM( TIME_TO_SEC( `total_hours` ) ) ) AS total,
CASE WHEN SEC_TO_TIME( SUM( TIME_TO_SEC( `total_hours` ) ) ) < ( 3600 *8 )
THEN 1
ELSE 0
END AS half_day
FROM work_details
WHERE `employee_id` = '28'
AND DATE
BETWEEN '2012-02-01'
AND '2012-02-29'
GROUP BY DATE
结果
DATE total half_day
2012-02-01 07:19:50 0
2012-02-02 07:38:21 0
2012-02-06 07:43:24 0
2012-02-07 07:21:36 0
2012-02-08 07:38:45 0
2012-02-09 06:05:22 0
2012-02-10 07:28:00 0
2012-02-13 07:37:38 0
2012-02-14 07:37:22 0
2012-02-15 07:35:10 0
2012-02-16 07:29:13 0
2012-02-17 07:07:23 0
2012-02-20 07:40:32 0
2012-02-21 07:43:32 0
2012-02-22 07:36:40 0
2012-02-23 07:37:57 0
2012-02-24 07:35:04 0
2012-02-27 09:54:02 0
2012-02-28 07:41:35 0
2012-02-29 08:01:11 0