Question

如何从预算中仅选择前1个补丁以删除重复记录

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

尝试这样的事情：

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

如果我理解正确，您有budget表的多个匹配项，而您只需要一个匹配项。如果是，请使用cross apply代替join。例如，要获取最新记录：

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

我认为您可以使用与Skipping records in subtable中相同的方法如果没有Id列，则可以执行大于[Date Time]

的列

删除doublelon内连接

3 个答案: