Question

这是我的第二次尝试。我正在尝试更新SQL表中的数据，其中有重复项来解决重复。

数据结构

DocNumbr     SeQnumbr     Dex_Row_Id
CRM025222    32768            1
CRM025222    32768            2
CRM025222    16384            3

期望的结果

DocNumbr     SeQnumbr     Dex_Row_Id
CRM025222    49152            1
CRM025222    32768            2
CRM025222    16384            3

对于每个副本，我需要通过Docnumbr + 16384将seqnumbr更新为重复项的seqnumbr的最大值.Dex_row_ID是主键并且是唯一的。

我的尝试

Begin
Declare @count as integer = (SELECT COUNT(*) AS DUPLICATES
FROM            dbo.RM10101
GROUP BY DocNumbr, SeqNumbr
HAVING        (COUNT(*) > 1))

Declare @counter as integer =1
While @Counter < @count


begin



Update RM10101 set SeqNumbr= (select MAX(dex_row_id) FROM RM10101 E2
WHERE E2.DocNumbr = RM10101.DocNumbr AND E2.SeqNumbr = RM10101.SeqNumbr) + (16384+) 
WHERE dex_row_id < (select MAX(dex_row_id) FROM RM10101 E2
WHERE E2.DocNumbr = RM10101.DocNumbr AND E2.SeqNumbr = RM10101.SeqNumbr
) 
SET @counter = @counter + 1
END
end

我已经尝试过上面的代码，但是用于添加到16384的值是所有行的最大seqnumbr，我需要它是重复集的最大值。我不是一个dba，但我正在被迫执行任务，而且我真的迷失了如何使连接或子查询正确。这是在SQL Server 2008中完成的。最初我被告知它是2000，所以如果有更好的方法使用cte或其他一些新方法，我会对它持开放态度。任何帮助将非常感激。谢谢，鲍勃

Answer 1

-- Build Test Data
create table #test_table(
    DocNumber varchar(255),
    SeqNumber int,
    Dex_Row_Id int
)

insert into #test_table
select 'CRM025222', 32768, 1 union all
select 'CRM025222', 32768, 2 union all
select 'CRM025222', 16384, 3

-- Solution: Start
;with cte as(
    select
        *,
        rn = row_number() over(partition by DocNumber order by SeqNumber desc)
    from #test_table
)
update cte 
    set SeqNumber = SeqNumber + 16384
where 
    rn = 1     
-- Solution: End

select * from #test_table

-- Drop test data
drop table #test_table

删除SQL Server 2008中的重复项

1 个答案: