我有一个出勤表
CREATE TABLE `msattendance` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`regnum` varchar(20) DEFAULT NULL,
`reg_b` varchar(20) DEFAULT NULL,
`in_hr` time NOT NULL,
`out_hr` time NOT NULL,
`in_info` varchar(20) DEFAULT NULL,
`out_info` varchar(20) DEFAULT NULL,
`in_date` date DEFAULT NULL,
`out_date` date DEFAULT NULL,
`in_mechine` varchar(3) DEFAULT NULL,
`out_mechine` varchar(3) DEFAULT NULL,
`upload_date` date DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `id` (`id`),
KEY `nik` (`nik`),
KEY `in_date` (`in_date`),
KEY `out_date` (`out_date`),
KEY `in_hr` (`in_hr`),
KEY `out_hr` (`out_hr`)
)
表上的示例值是：
+----+-----------+-------+----------+----------+---------+----------+------------+------------+------------+-------------+---------------------+---------------------+-------------+
| id | regnum | reg_b | in_hr | out_hr | in_info | out_info | in_date | out_date | in_mechine | out_mechine | upload_time | upload_time2 | upload_date |
+----+-----------+-------+----------+----------+---------+----------+------------+------------+------------+-------------+---------------------+---------------------+-------------+
| 1 | 216115657 | 5657 | 07:36:00 | 15:17:00 | 1 | 2 | 2017-02-18 | 2017-02-18 | 2 | 2 | 2017-03-16 08:09:15 | 2017-03-16 08:11:42 | 2017-03-16 |
| 2 | 216115657 | 5657 | 00:00:00 | 18:59:00 | NULL | 2 | NULL | 2017-02-17 | NULL | 2 | NULL | 2017-03-16 08:09:15 | 2017-03-16 |
| 3 | 216115657 | 5657 | 00:00:00 | 07:41:00 | NULL | 2 | NULL | 2017-05-25 | NULL | 4 | NULL | 2017-05-30 15:32:45 | 2017-05-30 |
| 4 | 216115657 | 5657 | 07:41:00 | 16:38:00 | 1 | 2 | 2017-05-26 | 2017-05-26 | 2 | 2 | 2017-05-30 15:51:07 | 2017-05-30 16:01:39 | 2017-05-30 |
| 5 | 216115657 | 5657 | 00:00:00 | 16:40:00 | NULL | 2 | NULL | 2017-05-25 | NULL | 4 | NULL | 2017-05-30 15:51:07 | 2017-05-30 |
| 10 | 216115657 | 5657 | 07:44:00 | 16:45:00 | 1 | 2 | 2017-11-22 | 2017-11-22 | 2 | 4 | 2017-11-23 10:01:38 | 2017-11-23 10:07:04 | 2017-11-23 |
| 11 | 216115657 | 5657 | 07:43:00 | 16:41:00 | 1 | 2 | 2017-11-23 | 2017-11-23 | 2 | 3 | 2017-11-23 10:07:04 | 2017-11-24 13:13:27 | 2017-11-23 |
| 12 | 216115657 | 5657 | 07:43:00 | 16:33:00 | 1 | 2 | 2017-11-24 | 2017-11-24 | 3 | 4 | 2017-11-24 13:13:27 | 2017-11-25 09:50:05 | 2017-11-24 |
| 13 | 216115657 | 5657 | 00:00:00 | 14:13:00 | 1 | 2 | NULL | 2017-11-25 | NULL | 4 | 2017-11-25 09:50:05 | 2017-11-27 10:32:51 | 2017-11-25 |
| 14 | 216115657 | 5657 | 07:43:00 | 16:32:00 | 1 | 2 | 2017-11-27 | 2017-11-27 | 3 | 4 | 2017-11-27 10:32:51 | 2017-11-28 14:00:27 | 2017-11-27 |
| 15 | 216115657 | 5657 | 07:43:00 | 00:00:00 | 1 | NULL | 2017-11-28 | NULL | 4 | NULL | 2017-11-28 14:00:27 | NULL | 2017-11-28 |
+----+-----------+-------+----------+----------+---------+----------+------------+------------+------------+-------------+---------------------+---------------------+-------------+
我使用查询
SELECT * FROM `msattendance` WHERE (in_date between '2017-11-23' and '2017-11-28') and reg_b = '5657'
但不显示记录ID号13
我使用先生的sql代码。 Nigel Ren
SELECT * FROM `msattendance`
WHERE ((in_date between '2017-11-23' and '2017-11-28')
or in_date is null)
and reg_b = '5657'
但是范围之外的另一个日期显示为
+--------+-----------+-------+----------+----------+---------+----------+------------+------------+------------+-------------+---------------------+---------------------+-------------+
| id | regnum | reg_b | in_hr | out_hr | in_info | out_info | in_date | out_date | in_mechine | out_mechine | upload_time | upload_time2 | upload_date |
+--------+-----------+-------+----------+----------+---------+----------+------------+------------+------------+-------------+---------------------+---------------------+-------------+
| 1493 | 216115657 | 5657 | 00:00:00 | 18:59:00 | NULL | 2 | NULL | 2017-02-17 | NULL | 2 | NULL | 2017-03-16 08:09:15 | 2017-03-16 |
| 100526 | 216115657 | 5657 | 00:00:00 | 07:41:00 | NULL | 2 | NULL | 2017-05-25 | NULL | 4 | NULL | 2017-05-30 15:32:45 | 2017-05-30 |
| 101727 | 216115657 | 5657 | 00:00:00 | 16:40:00 | NULL | 2 | NULL | 2017-05-25 | NULL | 4 | NULL | 2017-05-30 15:51:07 | 2017-05-30 |
| 297283 | 216115657 | 5657 | 00:00:00 | 14:13:00 | 1 | 2 | NULL | 2017-11-25 | NULL | 4 | 2017-11-25 09:50:05 | 2017-11-27 10:32:51 | 2017-11-25 |
| 293486 | 216115657 | 5657 | 07:44:00 | 16:45:00 | 1 | 2 | 2017-11-22 | 2017-11-22 | 2 | 4 | 2017-11-23 10:01:38 | 2017-11-23 10:07:04 | 2017-11-23 |
| 294748 | 216115657 | 5657 | 07:43:00 | 16:41:00 | 1 | 2 | 2017-11-23 | 2017-11-23 | 2 | 3 | 2017-11-23 10:07:04 | 2017-11-24 13:13:27 | 2017-11-23 |
| 296015 | 216115657 | 5657 | 07:43:00 | 16:33:00 | 1 | 2 | 2017-11-24 | 2017-11-24 | 3 | 4 | 2017-11-24 13:13:27 | 2017-11-25 09:50:05 | 2017-11-24 |
| 298601 | 216115657 | 5657 | 07:43:00 | 16:32:00 | 1 | 2 | 2017-11-27 | 2017-11-27 | 3 | 4 | 2017-11-27 10:32:51 | 2017-11-28 14:00:27 | 2017-11-27 |
| 299841 | 216115657 | 5657 | 07:43:00 | 00:00:00 | 1 | NULL | 2017-11-28 | NULL | 4 | NULL | 2017-11-28 14:00:27 | NULL | 2017-11-28 |
+--------+-----------+-------+----------+----------+---------+----------+------------+------------+------------+-------------+---------------------+---------------------+-------------+
如果提供in_date搜索，我可以在11月22日至11月28日期间显示表格内容，但输入日期为空？
答案 0 :(得分：0)
这就是你需要的。
以下查询将返回in_date不存在或在给定日期范围内的所有用户。
SELECT *
FROM `msattendance`
WHERE (in_date IS NULL OR in_date >= '2017-11-23')
AND in_date <= '2017-11-28'
AND reg_b = '5657'