Mysql WHERE子句以获取可以跨越新一天的事件

我有代表事件的数据。重要的栏目是

StartDate (date)
StartTime (time)
EndDate (date)
EndTime (time)

我的where子句是

WHERE HOUR(L.StartTime) <= 14 AND HOUR(L.EndTime) > 14 
AND DATE(NOW()) >= L.StartDate AND DATE(NOW()) <= L.EndDate 
AND L.StartDate <= '2015-01-22' AND L.EndDate >= '2015-01-22'

这意味着活动从下午2点到第二天凌晨1点开始。我的查询将不会返回该行，因为

AND HOUR(L.EndTime) > 14 

---

子句。

为什么不是or？原始搜索或声明的可能性：

WHERE (HOUR(L.StartTime) <= 14 AND HOUR(L.EndTime) > 14 
AND DATE(NOW()) >= L.StartDate AND DATE(NOW()) <= L.EndDate 
AND L.StartDate <= '2015-01-22' AND L.EndDate >= '2015-01-22')
OR (HOUR(L.StartTime) <= 14
AND DATE(NOW()) >= L.StartDate AND DATE(NOW()) <= L.EndDate
AND L.StartDate <= '2015-01-22' AND L.EndDate >= '2015-01-22'
AND L.StartDate != L.EndDate)

WHERE（小时（L.StartTime）14
和日期（现在（））>=L.StartDate和日期（现在（））
WHERE (HOUR(L.StartTime) <= 14 AND HOUR(L.EndTime) > 14 
AND DATE(NOW()) >= L.StartDate AND DATE(NOW()) <= L.EndDate 
AND L.StartDate <= '2015-01-22' AND L.EndDate >= '2015-01-22')
OR (HOUR(L.StartTime) <= 14
AND DATE(NOW()) >= L.StartDate AND DATE(NOW()) <= L.EndDate
AND L.StartDate <= '2015-01-22' AND L.EndDate >= '2015-01-22'
AND L.StartDate != L.EndDate)