MySql和PHP時間重疊

Question

例如，我有以下時間要插入：

7 am to 12pm

我數據庫中的數據是：

8 am to 9 am ,
11 am to 1 pm ,
5 am to 7 am

我需要在'SELECT'語句中添加什么'WHERE'語句，以便如果它返回一個值，則表示當前時間已經為'RESERVED'如果不是，則其“ AVAILABLE '

我當前的代碼是

select eventDate,timestart,timeend from eventcalendar where eventDate='$eventdate' and
 ((Cast('$timestart' as time) > timestart  and Cast('$timestart' as time) < timeend) or  
 (Cast('$timeend' as time) > timestart  and Cast('$timeend' as time) < timeend)) or 
((Cast('$timestart' as time) between timestart and timeend) or ((Cast('$timeend' as time) between timestart and timeend)))

Answer 1

我終於通過添加和反轉給定解決了它

"select eventDate,timestart,timeend from eventcalendar where eventDate='$eventdate' and 
 ((Cast('$timestart' as time) > timestart  and Cast('$timestart' as time) < timeend) or  
 (Cast('$timeend' as time) > timestart  and Cast('$timeend' as time) < timeend)) or 

  (timestart >  Cast('$timestart' as time) and timestart < Cast('$timeend' as time))  or
(timeend >  Cast('$timestart' as time) and timeend < Cast('$timeend' as time))   "