Sql 自动生成唯一密钥不一致
我正在尝试以以下格式创建唯一密钥: ABC123456 例如,它从ABC000001开始,到ABC99999结束,基本上前三个字符是ABC,然后是6个数字 我目前有以下疑问:Sql 自动生成唯一密钥不一致,sql,sql-server,tsql,Sql,Sql Server,Tsql,我正在尝试以以下格式创建唯一密钥: ABC123456 例如,它从ABC000001开始,到ABC99999结束,基本上前三个字符是ABC,然后是6个数字 我目前有以下疑问: SELECT 'ABC' + CAST(REPLICATE('0',6-LEN(RTRIM(ROW_NUMBER() OVER (ORDER BY (SELECT NULL))))+ (SELECT Counter from Counters)) + RTRIM(ROW_NUMBER() OVER (ORDE
SELECT
'ABC' + CAST(REPLICATE('0',6-LEN(RTRIM(ROW_NUMBER() OVER (ORDER BY (SELECT NULL))))+ (SELECT Counter from Counters)) + RTRIM(ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) + (SELECT Counter from Counters)) as CHAR(9)) as InvoiceNumber,
ID,
RandomNumber
from
RandomNumbers
以下是一些示例数据:
CREATE TABLE [dbo].[Counters](
[Counter] [int] NULL
) ON [PRIMARY]
INSERT INTO [dbo].[Counters]
([Counter])
VALUES
(0)
CREATE TABLE [dbo].[RandomNumbers](
[ID] [int] NULL,
[RandomNumber] [int] NULL
) ON [PRIMARY]
GO
with randowvalues
as(
select 1 id, CAST(RAND(CHECKSUM(NEWID()))*100 as int) randomnumber
union all
select id + 1, CAST(RAND(CHECKSUM(NEWID()))*100 as int) randomnumber
from randowvalues
where
id < 1000
)
Insert into RandomNumbers
(
ID,
RandomNumber
)
select *
from randowvalues
OPTION(MAXRECURSION 0)
然后重新运行主查询,它抛出编号。我做错了什么?使用STUFF()
函数:
with
cte
as
(
SELECT
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) + (SELECT Counter from Counters) as InvNo,
ID,
RandomNumber,
'ABC000000' as SampleNo
from
RandomNumbers
)
select
stuff(SampleNo, (Len(SampleNo) - Len(InvNo)) + 1, Len(SampleNo), InvNo) as InvoiceNumber,
ID,
RandomNumber
from
cte;
这个怎么样,如果你有一个
IDENTITY
列就更好了
SELECT STUFF('ABC000000',
10 - LEN( CAST(RN AS VARCHAR) ),
LEN(CAST(RN AS VARCHAR)),
CAST(RN AS VARCHAR)
) GenKey,
SomeCols
FROM
(
SELECT *,
ROW_NUMBER() OVER(ORDER BY SomeCols) RN --Simulate IDENTITY column if you have one it would be better
FROM YourTable
) T;
返回:
+-----------+----------+
| GenKey | SomeCols |
+-----------+----------+
| ABC000001 | SomeData |
| ABC000002 | SomeData |
| ABC000003 | SomeData |
| ABC000004 | SomeData |
| ABC000005 | SomeData |
| ABC000006 | SomeData |
| ABC000007 | SomeData |
| ABC000008 | SomeData |
| ABC000009 | SomeData |
| ABC000010 | SomeData |
| … | |
+-----------+----------+
如果您已经有了一个
IDENTITY
列,那么最好得到正确的GenKey
即使是从YourTable
中删除的一些行,甚至YourTable
也有超过999999
行,下面是一个模拟这种情况。您是如何创建这个数字的?您的公式看起来有点奇怪,计数器的用途是什么?
?您为什么要这样做?如果您只想生成这样的数字,可以使用序列。如果您想将这样的字段添加到表中,有更好的方法。行编号
,嗯。可以删除行吗?@Philip。序列具有这些能力。此外,它们由数据库记录和支持。不要再发明轮子了。谢谢@Sami-会测试出来的:)谢谢@Mohammad-会测试出来的。
+-----------+----------+
| GenKey | SomeCols |
+-----------+----------+
| ABC000001 | SomeData |
| ABC000002 | SomeData |
| ABC000003 | SomeData |
| ABC000004 | SomeData |
| ABC000005 | SomeData |
| ABC000006 | SomeData |
| ABC000007 | SomeData |
| ABC000008 | SomeData |
| ABC000009 | SomeData |
| ABC000010 | SomeData |
| … | |
+-----------+----------+