Question

我的表设置类似于以下内容：

Userid | LastFirstMI |   Active
  1      Doe, Jane S     False <<<
  2      Doe, Jane S     True 
  3      Smith, John P   False 
  4      Lee, Bob R      False 
  5      Bob, Joe L      False <<< 
  6      Bob, Joe L      True

我只想选择Active值为False的重复名称。我用＆lt;＆lt;＆lt;＆lt;＆lt;＆lt;＆lt;＆lt;＆lt;＆lt;＆lt;＆lt;我搜索过并找到了类似的问题，但我似乎无法找到一个显示如何选择特定副本的问题。提前谢谢。

Answer 1

select t1.userid, t1.LastFirstMI, t1.Active from table t1,table t2
where t1.active='False' and t1.LastFirstMI=t2.LastFirstMI and t2.active='True'

尝试上面的代码，如果需要，请根据您的数据库引擎更改active=False条件。

Answer 2

假设您的列活动为字符串

这应该适用于mysql和SQLServer

select * from my_table where 
Active  = 'False' and LastFirstMi in (
  select t.LastFirstMi from ( 
    select  LastFirstMI, count(*)
    from my_table 
    group LastFirstMI 
    having count(*)>1
  ) t 
)

Answer 3

您可以在大多数数据库中使用row_number：

Select *
From (
  Select t.*
    ,row_number() over (partition by lastfirstMI order by Active) rn
  From your_table t
) t where rn = 1

Answer 4

如果有相应的Active = 'False'帐户，这将返回Active = 'True'的重复项。

select userid, LastFirstMI, Active 
from t
where t.Active = 'False'
  and exists (
    select 1
    from t as i
    where i.LastFirstMi = t.LastFirstMi
      and i.Active = 'True'
  )

即使没有相应的Active = 'False'帐户，也会返回Active = 'True'的所有重复项。

select userid, LastFirstMI, Active 
from t
where t.Active = 'False'
  and exists (
    select 1
    from t as i
    where i.LastFirstMi = t.LastFirstMi
      and i.UserId <> t.UserId
  )

Answer 5

<select v-model="selected.car" :change="getModels()">
    <option v-for="car in cars" value="car.id">{{ car.name }}</option>
</select>

<select v-model="selected.model" :change="getYear()">
    <option v-for="model in models" :value="model.id">{{ model.name }}</option>
</select>

...

选择特定的重复条目

5 个答案: