Question

我正在使用MySQL，我有以下表结构

Id  id2 classId sectionId   validFrom   validTill
------------------------------------------------------
1   1       5       13      2016-01-01  2016-03-30
2   1       5       22      2016-01-15  2016-03-30
3   1       5       23      2016-01-15  2016-04-29
4   1       5       13      2016-04-01  2016-04-30
9   10      6       24      2016-01-17  2016-02-05
10  10      6       25      2016-01-23  2016-02-05
11  10      6       24      2016-01-31  2016-02-05

我的SQL语句是

SELECT count(*) as timeCount FROM TimeTableClassSection a 
WHERE classId=5 AND sectionId=13 AND ((a.ValidFrom BETWEEN '2016-01-18' AND '2016-01-24') OR (a.ValidTill BETWEEN '2016-01-18' AND '2016-01-24'))

它返回timeCount = 0。但它应该返回1作为记录，Id = 1落在此日期范围('2016-01-18' AND '2016-01-24')

之间

我正在尝试实现，找出特定classId＆amp;的任何重叠记录。 sectionId在提供的日期范围之间。如果classId=5和sectionId=13存在validFrom=2016-01-01 validTill=2016-03-30，则此日期范围('2016-01-18' AND '2016-01-24')之间的任何日期范围都应将此记录作为计数。

If I give date range 2015-12-25 to 2016-09-20 then record count should = 1
If I give date range 2016-2-1 to 2016-02-20 then record count should = 1
If I give date range 2016-2-1 to 2016-09-20 then record count should = 1

我在这里做错了...所有日期格式都在YYYY-MM-DD

Answer 1

您只检查边界是否在日期范围内，但不检查数据范围是否在边界内。你应该扩展你的标准：

...AND ((a.ValidFrom BETWEEN '2016-01-18' AND '2016-01-24')
       OR (a.ValidTill BETWEEN '2016-01-18' AND '2016-01-24')
       OR (a.ValidFrom<'2016-01-18' AND a.ValidTill>'2016-01-24'))

如何在日期之间找到重叠记录

1 个答案: