Php 如何检查表(mysql)中的时间分配重叠?
我在mysql中有一个时间分配表。在我将新记录推入之前,我需要检查它是否与现有日期和时间段重叠 db中的示例数据如下Php 如何检查表(mysql)中的时间分配重叠?,php,mysql,sql,Php,Mysql,Sql,我在mysql中有一个时间分配表。在我将新记录推入之前,我需要检查它是否与现有日期和时间段重叠 db中的示例数据如下 Start Date End Date | Start Time | End Time 2017-01-01 | 2017-01-01 | 10:00 | 11:00 2017-01-01 | 2017-01-01 | 08:00 | 09:00 2017-01-01 | 2017-01-02 | 01:00 | 02:00 最后一条记录
Start Date End Date | Start Time | End Time
2017-01-01 | 2017-01-01 | 10:00 | 11:00
2017-01-01 | 2017-01-01 | 08:00 | 09:00
2017-01-01 | 2017-01-02 | 01:00 | 02:00
最后一条记录是指2017-01-01和2017-01-02两天都分配了01:00至02:00的时间
下面是一些我将尝试推送的示例记录。预期结果显示为最后一列。
我需要运行查询,确保这些记录在数据库中不会重叠
Start Date End Date | Start Time End Time
2017-01-01 | 2017-01-01 | 01:30 | 01:31 | OVERLAP
2017-01-02 | 2017-01-02 | 01:30 | 01:31 | OVERLAP
2017-01-01 | 2017-01-02 | 01:30 | 01:31 | OVERLAP
2017-01-01 | 2017-01-02 | 00:30 | 00:31 | PASS
2017-01-03 | 2017-01-03 | 00:30 | 00:31 | PASS
2016-12-30 | 2017-01-04 | 01:30 | 01:31 | OVERLAP
2016-12-30 | 2016-12-30 | 00:30 | 00:31 | PASS
我无法编写满足所有条件的查询。
请帮助我查询数据库中的重叠记录,我的输入是$start\u date、$end\u date、$start\u time和$end\u time。我进行了此查询。请用更多的数值进行检查。我是在MSSQL上做的,但是Mysql应该是一样的。如有任何问题,请与我联系
SELECT A.ID, A.START_DATE, A.END_DATE, A.START_TIME, A.END_TIME
, CASE WHEN B.START_DATE IS NULL THEN 'PASS' ELSE 'OVERLAP' END AS CHK
, B.START_DATE,B.END_DATE, B.START_TIME, B.END_TIME
FROM NEW_RECORDS A
LEFT JOIN EXISTING_RECORDS B ON A.START_DATE <=B.END_DATE
AND A.END_DATE>=B.START_DATE
AND A.START_TIME<=B.END_TIME
AND A.END_TIME>=B.START_TIME
听起来您确实有一个满足大多数或至少某些条件的查询。你不妨分享一下。
+--------+-------------------------+-------------------------+------------------+------------------+---------+
| ID | START_DATE | END_DATE | START_TIME | END_TIME | CHK |
+--------+-------------------------+-------------------------+------------------+------------------+---------+
| 1 | 2017-01-01 00:00:00.000 | 2017-01-01 00:00:00.000 | 01:30:00.0000000 | 01:31:00.0000000 | OVERLAP |
| 2 | 2017-01-02 00:00:00.000 | 2017-01-02 00:00:00.000 | 01:30:00.0000000 | 01:31:00.0000000 | OVERLAP |
| 3 | 2017-01-01 00:00:00.000 | 2017-01-02 00:00:00.000 | 01:30:00.0000000 | 01:31:00.0000000 | OVERLAP |
| 4 | 2017-01-01 00:00:00.000 | 2017-01-02 00:00:00.000 | 00:30:00.0000000 | 00:31:00.0000000 | PASS |
| 5 | 2017-01-03 00:00:00.000 | 2017-01-03 00:00:00.000 | 00:30:00.0000000 | 00:31:00.0000000 | PASS |
| 6 | 2016-12-30 00:00:00.000 | 2017-01-04 00:00:00.000 | 01:30:00.0000000 | 01:31:00.0000000 | OVERLAP |
| 7 | 2016-12-30 00:00:00.000 | 2016-12-30 00:00:00.000 | 00:30:00.0000000 | 00:31:00.0000000 | PASS |
+--------+-------------------------+-------------------------+------------------+------------------+---------+