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我有一个查询引擎历史数据的 sql 数据库。其中一个特点是，存储过程每天都会在所有数据中搜索特定事件，如果找到该事件，它将把它插入到一个新表中。

问题是这些数据必须是唯一的......

表头如下：

ID / ID_Location / IDDown / IDUp / DtDown / DtUp / TimeDifference / IsExempt / Reason / Details / OrigDtUp

sql查询是：

insert into exempts(ID_Location, iddown, idup, dtdown, dtup, timedifference)
select ID_Location, iddown, idup, dtdown, dtup, DATEDIFF(MINUTE, dtdown, dtup) as timedifference
from @tmptbl
except
select ID_Location, iddown, idup, dtdown, dtup, timedifference from exempts

但是我需要查询来检查DtUp和OrigDtUp列并忽略时间差异，因为用户可以将 更改为DtUp列表中的任何值并且原始DtUp值移动到OrigDtUp记录现在不同并且重新插入记录但使用原始值？ ?

提前致谢！！尼尔

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1 回答 1

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使用左连接，更容易看出逻辑：

   insert into exempts(ID_Location, iddown, idup, dtdown, dtup, timedifference) 
    select t.ID_Location, t.iddown, t.idup, t.dtdown, t.dtup, DATEDIFF(MINUTE, dtdown, dtup) as timedifference 
    from @tmptbl as t
      left join exempts as e 
        on  t.ID_Location = e.ID_Location 
        and t.iddown = e.iddown
        and t.idup = e.idup
        and t.dtdown = e. dtdown
        and t.DtUp = e.OrigDtUp --  <<  Match diff columns here
    where t.ID_Location is null
于 2012-05-10T11:54:36.610 回答