所以我有一张下面的表格
Date Time Field3 Field4 - etc.
--------------------------------------------------
05/07/11 17:45 blah blah
05/07/11 19:45 blah blah
08/07/11 17:30
08/07/11 19:00
09/07/11 19:00
等
我目前在我的WHERE声明中有一条规则,因此显示今天之间的所有日期(所以它将是05/07/11直到3年后的同一日期05/07/14)。
我还想在WHERE语句下添加另一条规则,以便它只显示当前时间前两小时的时间(当前日期等于表中的日期)。
所以在05/07/11 19:00它应该显示:
Date Time Field3 Field4 - etc.
--------------------------------------------------
05/07/11 17:45 blah blah
05/07/11 19:45 blah blah
08/07/11 17:30
08/07/11 19:00
09/07/11 19:00
同一天21:46,现在应该显示:
Date Time Field3 Field4 - etc.
--------------------------------------------------
08/07/11 17:30
08/07/11 19:00
09/07/11 19:00
我如何在SQL中执行此操作?我认为它必须是一个if then或case当时声明,但我还没有能够解决它?
ALSO日期是在VB.Net中生成的,所以时间也是如此。当前的sql(和工作)代码是:
SELECT m.MatchID Manage, m.Date, m.Time, t.TeamCode "Home", b.TeamCode "Away",
g.GroundName "Ground", ( SUBSTRING(u.GivenName,1,1) + '. ' + RTRIM(u.Surname) ) AS Referee,
( SUBSTRING(v.GivenName,1,1) + '. ' + RTRIM(v.Surname) ) AS "Assistant 1",
( SUBSTRING(w.GivenName,1,1) + '. ' + RTRIM(w.Surname) ) AS "Assistant 2",
a.FOfficialID, a.AssessorID, a.RefereeAID, a.AReferee1AID, a.AReferee2AID,
a.FOfficialAID, a.AssessorAID, 'Details' "Details", t.AgeGroupID, r.WetWeatherID
FROM Match m
LEFT OUTER JOIN Appointment a ON m.MatchID=a.MatchID
LEFT OUTER JOIN WetWeather r ON r.MatchID=m.MatchID
INNER JOIN Team t ON m.HomeTeamID=t.TeamID
INNER JOIN Team b ON m.AwayTeamID=b.TeamID
INNER JOIN Ground g ON g.GroundID=m.GroundID
LEFT OUTER JOIN Users u ON u.UserID=a.RefereeID
LEFT OUTER JOIN Users v on v.UserID=a.AReferee1ID
LEFT OUTER JOIN Users w on w.UserID=a.AReferee2ID
WHERE (m.Date BETWEEN '05-Jul-2011' AND '05-Jul-2014')
答案 0 :(得分:3)
如果您使用数据库时间和日期字段,则可以简单地与当前日期/时间进行比较
…
WHERE `Date` > NOW()
AND `Time` > NOW()
答案 1 :(得分:3)
添加列日期和时间以及间隔-2小时+ 3年的比较。
select *
from YourTable
where Date+cast(Time as datetime) between dateadd(hour, -2, getdate()) and dateadd(year, 3, getdate())
不确定上述查询中是否可以使用Date上的任何索引。如果您遇到性能问题,可以尝试这样做。使用Date索引可能会做得更好。
select *
from YourTable
where Date between cast(getdate() as date) and dateadd(year, 3, getdate()) and
Date+cast(Time as datetime) > dateadd(hour, -2, getdate())
答案 2 :(得分:1)
我会通过加入子查询来实现。类似的东西:
select ...
from Match as m
inner join
(select mSub.MatchID,
case when Date+cast(Time as datetime) between dateadd(hour,-2,getdate())
and getdate() then 1 else 0 end as Show
from Match as mSub
where Date between
cast(getdate() as date)
and cast(dateadd(year,3,getdate()) as date)
) as Control
on Control.MatchID=m.MatchID
因此,子查询会为您提供可在CASE语句中使用的Show列,并进行过滤。