我在mysql中有一个时间分配表。在我将新记录推入其中之前,我需要检查它是否与现有的日期和时间段重叠。
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
最后一条记录表示2017-01-01和2017-01-02,小时01:00至02:00均在两天内分配。
以下是我将尝试推送的一些示例记录。预期结果显示为最后一列。 我需要运行查询并确保这些记录不会在db中重叠。
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。 请帮我查询db中的重叠记录,我的输入是$ start_date,$ end_date,$ start_time和$ end_time。
答案 0 :(得分:1)
我做了这个查询。请检查更多值。我是在MSSQL上做的,但对于Mysql来说应该是一样的。如有任何问题请联系我。
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
输出:
+--------+-------------------------+-------------------------+------------------+------------------+---------+
| 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 |
+--------+-------------------------+-------------------------+------------------+------------------+---------+