select em.emailID,em.MailTo,cast(em.StartDate as datetime) as StartDate
from emails em
where StartDate<cast('2011/07/02 19:23' as datetime)mysql時間比較datetime
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select em.emailID,em.MailTo,cast(em.StartDate as datetime) as StartDate
from emails em
where StartDate<cast('2011/07/02 19:23' as datetime)