不匹配的MySQL日期评估相等

Question

我有这个问题：

select w.EventName, w.EventLocation, CONCAT(CURDATE(), ' ', w.RecurringEventTime) AS RecurringEventTime, w.OneTimeDateTime
from EventClickIns eci
join WebEvents w
on eci.WebEventID = w.ID
where eci.UserID = 493
and eci.WebEventID <> 10
and eci.InvitationID <> 175
and date(eci.ClickInDate) = date(now())
and (RecurringEventTime = '2018-03-19 12:00:00' OR w.OneTimeDateTime = '2018-03-19 12:00:00')
limit 1

我得到了这条记录的结果：

EventName      EventLocation      RecurringEventTime     OneTimeDateTime
========================================================================
Evt ABC        123 Anystreet      2018-03-20 12:00:00    NULL

当我的where clause中的RecurringEventTime与匹配记录中的RecurringEventTime不同时，为什么我得到匹配记录令人困惑。 OneTimeDateTime为null，因此无法匹配。

我错过了什么？

Answer 1

感谢Sam和Solarflare的提示，我明白了：

select w.EventName, w.EventLocation, CONCAT(CURDATE(), ' ', w.RecurringEventTime) AS RecurringEventTime, w.OneTimeDateTime
from EventClickIns eci
join WebEvents w
on eci.WebEventID = w.ID
where eci.UserID = 493
and eci.WebEventID <> 10
and eci.InvitationID <> 175
and date(eci.ClickInDate) = date(now())
and (CONCAT(CURDATE(), ' ', w.RecurringEventTime) = '2018-03-19 12:00:00' OR w.OneTimeDateTime = '2018-03-19 12:00:00')
limit 1