T-SQL 截断文本并在末尾添加数字以避免重复

Question

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以 ~1 结尾，第二次重复以 ~2 结尾。这是我所拥有的示例：

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，我只需要在截断后让它独一无二。截断后可能有超过 3 或 4 个重复。

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

Answer 1

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位置。

假设您的重复次数少于 10 次，您可以这样做：

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));

同样的想法也可以用于select。

Answer 2

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

返回

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

Answer 3

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

Answer 4

假设您的表是 COMPANY，字段是 CompanyName..... 您将不得不 tweek 但希望它有所帮助..

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

Answer 5

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