在没有主键的情况下更新 SQL Server 中的重复项

Question

我需要一个更新语句来解决 SQL Server 2000 上表中的重复问题。表结构如下所示。此表中没有主键。我需要一条 SQL 语句，在有重复值的情况下更新值，方法是将值加 5，直到不再有重复值。

DocNumber       SeQNumber
Doc001           900
Doc001           900
Doc001           900
Doc001           903
Doc001           904

想要的结果

DocNumber       SeqNUmber
Doc001           900
Doc001           905
Doc001           910
Doc001           903
Doc001           904

这是我尝试过的 我的最新尝试如下所示。在那个例子中，我只是添加了计数器，但 +5 是我真正需要的。

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
With UpdateData  As
(
SELECT  DocNumbr,SeqNumbr,
ROW_NUMBER() OVER (ORDER BY [SeqNumbr] DESC) AS RN
FROM RM10101
)
UPDATE  RM10101 SET SeqNumbr = (select max(SeqNumbr) from RM10101 where docNumbr =          RM10101.DocNumbr and SeqNumbr=RM10101.SeqNumbr) + (@counter)
FROM RM10101
INNER JOIN UpdateData ON RM10101.DocNumbr = UpdateData.DocNumbr 
where rn =@counter   
SET @counter = @counter + 1
end
end

任何帮助将不胜感激。
谢谢， 鲍勃

Answer 1

如果我有如下序列，脚本可能会失败： ('Doc001',900), ('Doc001',900), ('Doc001',900), ('Doc001',903), ('Doc001',904), ('Doc001',905), (' Doc001',905), ('Doc001',905), ('Doc001',910), ('Doc001',910), ('Doc001',915), ('Doc001',915)

脚本会报错如下： 消息 512，第 16 级，状态 1，第 1 行 子查询返回超过 1 个值。当子查询跟随 =、!=、、>= 或子查询用作表达式时，这是不允许的。

正确的脚本是：

WHILE (SELECT SUM(X.A) FROM (  SELECT COUNT(*) A FROM Table_1 GROUP BY DocNumber, SeqNumber HAVING count(*) > 1) X) > 0
BEGIN
   With TableAdjusted as (
        select DocNumber, SeqNumber, row_number() over (partition by DocNumber, SeqNumber order by (select NULL)) RowID
        from Table_1
   )

   update A
     set SeqNumber = (B.RowID - 1)*5 + B.SeqNumber
   from TableAdjusted A
   inner join TableAdjusted B
      on A.DocNumber = B.DocNumber and A.SeqNumber = B.SeqNumber and A.RowID = B.RowID 
   where A.RowID > 1
END

Answer 2

;with tb1(id, seqNUm, docNum) as (
SELECT  ROW_NUMBER() OVER (ORDER BY SeQNumber), DocNumber, SeQNumber From table1
)

update tb1 set docnum=201 where id=2

• 设置 id 任何你想更新的行

Answer 3

这是一个开始，我很难将此选择查询转换为更新语句。

--Build your tally table and sample data

if object_id('dbo.tally') is not null 
        drop table dbo.tally

select top 11000 
    identity(int,1,1) as n
into tally
from master.dbo.syscolumns sc1,
    master.dbo.syscolumns sc2

create table #test_table (
    DocNumber varchar(100),
    SeqNumber int
)

insert into #test_table
select 'Doc001', 900 union all
select 'Doc001', 900 union all
select 'Doc001', 900 union all
select 'Doc001', 903 union all
select 'Doc001', 904

select 
    t1.DocNumber,
    t1.SeqNumber,
    NewSeqNumber =  t1.SeqNumber + (5 * (t.n - 1))
from (
    select
        *,
        c = count(*)
    from #test_table
    group by
        DocNumber, SeqNumber
)t1
inner join tally t
    on t.n <= t1.c

drop table #test_table

Answer 4

一个糟糕的情况是

('Doc001',900), ('Doc001',900), ('Doc001',900), ('Doc001',903), ('Doc001',904), ('Doc001',905), ('Doc001',905), ('Doc001',905), ('Doc001',910), ('Doc001',910), ('Doc001',915), ('Doc001',915)

当您将行从 900 更新到 905 和 910 时，您就会遇到以前不存在的重复情况。

要解决它，请使用以下查询：

WHILE EXISTS (SELECT * FROM Table1 GROUP BY DocNumber, SeqNumber HAVING count(*) > 1)
BEGIN

   With TableAdjusted as (
        select DocNumber, SeqNumber, row_number() over (partition by DocNumber, SeqNumber order by (select NULL)) RowID
        from Table1
   )

   update A
     set SeqNumber = (B.RowID - 1)*5 + B.SeqNumber
   from TableAdjusted A
   inner join TableAdjusted B
      on A.DocNumber = B.DocNumber and A.SeqNumber = B.SeqNumber and A.RowID = B.RowID 
   where A.RowID > 1
END

select * from Table1 order by DocNumber, SeqNumber

SQL Fiddle