sql server-T-sql截断文本并在末尾添加数字以避免重复

我需要将一列中的数据截断为10个字符。但是，我不能有任何重复项，所以我希望任何重复项都以~1结尾表示第一个重复项，~2结尾表示第二个重复项。下面是我的一个例子：

Column
------
The ABC Company Inc.
The ABC Cooperative
XYZ Associates LLC.

我希望结果是：

Column
------
The ABC ~1
The ABC ~2
XYZ Associ

结尾不一定是~1或~2，我只需要一些东西，使它在截断后变得独特。截断后可能有3个或4个以上的重复项。

到目前为止，我只是手动截断和编辑表格：

update Table set Column = Left(Column, 10) where len(Column) > 10

首先，您关心的是前8个字符，而不是前10个字符，因为您需要为额外的数字预留插槽。

假设你的重复次数少于10次，你可以这样做：

with toupdate as (
      select t.*,
             row_number() over (partition by left(col, 8) order by (select null)) as seqnum,
             count(*) over (partition by left(col, 8) ) as cnt
      from t
update toupdate
    set col = (case when cnt = 1 then left(col, 10)
                    else left(col, 8) + '~' + cast(seqnum as char(1));

同样的想法可以用于CCD_ 1。

Declare @Table Table (Column1 varchar(50))
Insert into @Table values 
('The ABC Company Inc.'),
('The ABC Cooperative'),
('XYZ Associates LLC.')
Select NewColumn = Concat(substring(Column1,1,10),' ~',Row_Number() over (Partition By substring(Column1,1,10) Order by Column1))
 From @Table

NewColumn
The ABC Co ~1
The ABC Co ~2
XYZ Associ ~1

数字很嘈杂，所以我只在必要时添加它们：

select case when _r > 1 
    then Company + '~' + cast(_r as varchar(5)) 
    else Company end as Company 
from (
    select Company
        , ROW_NUMBER() over (partition by Company order by Company) as _r
    from(
        select left(Company, 10) as Company
        from MyTable
    ) x
) y
order by Company

Company
--------------
The ABC Co
The ABC Co~2
XYZ Associ

假设您的表是COMPANY，字段是CompanyName。。。。。你将不得不花呢，但希望它能有所帮助。。

SELECT SUBSTRING( Q.Comp, 1, 5) + '~' + CONVERT(nvarchar(4), Row) as NewFieldValue FROM
(
SELECT ROW_NUMBER() OVER(PARTITION BY SUBSTRING( C.CompanyName, 1, 6) ORDER BY SUBSTRING( C.CompanyName, 1, 6)) AS Row,
SUBSTRING( C.CompanyName, 1, 6) as Comp
FROM COMPANY C
)Q

DECLARE @Table TABLE (Column1 varchar(50))
INSERT INTO @Table VALUES
      ('The ABC Company Inc.')
    , ('The ABC Cooperative')
    , ('XYZ Associates LLC.')
    , ('Acme')
    , ('Ten Char 123')
    , ('Ten Char 132')
    , ('Ten Char 231')

;WITH FLen
    AS (
        SELECT Column1, LEFT(LEFT(Column1,13) + SPACE(13),13) + CHAR(164) AS Column2
            FROM @Table
        )
,TenCharPD -- Includes possible duplicates
    AS (
        SELECT Column1, LEFT(Column2,8) + 
            RIGHT('0' + CAST (
            (ASCII(SUBSTRING(Column2, 9,1)) +
            ASCII(SUBSTRING(Column2,10,1)) +
            ASCII(SUBSTRING(Column2,11,1)) +
            ASCII(SUBSTRING(Column2,12,1)) +
            ASCII(SUBSTRING(Column2,13,1)))%100
            AS NVARCHAR(2)),2) AS Column2
        FROM Flen
        )
,CullPD
    AS (
        SELECT Column1, Column2,
            ROW_NUMBER() OVER (PARTITION BY Column2 ORDER BY Column2) AS rowx
        FROM TenCharPD
        )
UPDATE t1
    SET Column1 = LEFT(Column2,9) +
    CASE rowx
        WHEN 1 THEN RIGHT(Column2,1)
        ELSE CHAR(rowx + CAST (RIGHT(Column2,1) AS INT) * 5 + 63)
        END
    FROM @Table t1
        JOIN CullPD cpd
            ON t1.Column1 = cpd.Column1
SELECT * FROM @Table

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