刪除doublon內加入

Question

我如何才能刪除重複記錄

update r 
    set Comp = t.Comp 
from [QlikDataWarehouse].[dbo].[Vente]r with (NOLOCK) inner join 
    [QlikDataWarehouse].[dbo].[Budget] t 
    on t.[Code Site] = r.[Code Site] and 
     t.[Code Rayon] = substring(r.[Code Structure],1,4) and 
     t.[Date Time] = convert(date,r.[Date Time]) 
where r.[Date Time] >= '2015-01-01 00:0:00.000'; 

Answer 1

嘗試是這樣的選擇，從預算只有前1補償：

with topComp as (
    select t.[Code Site], t.[Code Rayon], t.[Date Time], max(t.[Comp]) 
    from [QlikDataWarehouse].[dbo].[Budget] t 
    group by t.[Code Site], t.[Code Rayon], t.[Date Time] 
); 

update r 
    set Comp = t.Comp 
from [QlikDataWarehouse].[dbo].[Vente]r with (NOLOCK) inner join 
    topComp t 
    on t.[Code Site] = r.[Code Site] and 
     t.[Code Rayon] = substring(r.[Code Structure],1,4) and 
     t.[Date Time] = convert(date,r.[Date Time]) 
where r.[Date Time] >= '2015-01-01 00:0:00.000'; 

Answer 2

如果我理解正確的話，你有多個匹配budget表，你只需要一個。如果是，則使用cross apply而不是join。例如，爲了獲得最新的記錄：

update r 
    set Comp = t.Comp 
from [QlikDataWarehouse].[dbo].[Vente]r with (NOLOCK) cross apply 
    (select top 1 t.* 
     from [QlikDataWarehouse].[dbo].[Budget] t 
     where t.[Code Site] = r.[Code Site] and 
      t.[Code Rayon] = substring(r.[Code Structure],1,4) and 
      t.[Date Time] = convert(date,r.[Date Time]) 
     order by t.[Date Time] desc 
    ) t 
where r.[Date Time] >= '2015-01-01 00:0:00.000'; 

Answer 3

我想你可以用同樣的方法在Skipping records in subtable。
如果沒有Id列，則可以執行大於[Date Time]