Question

我的发票号码存储为nvarchar（25）。

他们的格式为'#### AA' 其中####是发票编号，AA是版本号（部分订单发货）我不能改变格式。

我创建了两个标量函数：

CREATE FUNCTION [dbo].[fnNumbersFromStr](@str varchar(8000))
RETURNS int
AS
BEGIN
  WHILE PATINDEX('%[^0-9]%',@str)> 0
  SET @str = REPLACE(@str, SUBSTRING(@str, PATINDEX('%[^0-9]%', @str), 1), '')
  RETURN CAST(@str AS INT)
END

这是兄弟：

CREATE FUNCTION [dbo].[fnStringFromNum](@str varchar(25))
RETURNS varchar(25)
AS
BEGIN
  WHILE PATINDEX('%[^a-z]%',@str)> 0
  SET @str = REPLACE(@str, SUBSTRING(@str, PATINDEX('%[^a-z]%', @str), 1), '')
  RETURN @str
END

我对这个剧本感到困惑：

SELECT
strInvoiceNo,
    dbo.fnNumbersFromStr(strInvoiceNo) AS [InvoiceNumber],
    dbo.fnStringFromNum(strInvoiceNo) AS [InvoiceString]
FROM @TempTable

运行时返回：

strInvoiceNo    InvoiceNumber    InvoiceString

1000A           1000             A

1000B           1000             B

1000C           1000             C

1001A           1001             A

1001B           1001             B

1002AA          1002             AA

1002AB          1002             AB

1003A           1003             A

1004A           1004             A

我无法从这里弄清楚下一步。我被卡住了。

我希望select只返回最新的Invoice Versions：

100℃
1001B
1002AB
1003A
1004A

Sql，Lamda或Linq对我来说会很好。

提前致谢，

Answer 1

试试这个：

SELECT
  InvoiceNumber + MAX(InvoiceString) As strInvoiceNo    
FROM
(
   SELECT
       dbo.fnNumbersFromStr(strInvoiceNo) AS [InvoiceNumber],
       dbo.fnStringFromNum(strInvoiceNo) AS [InvoiceString]
   FROM @TempTable
) As tbl
GROUP BY InvoiceNumber

Answer 2

我认为你不需要任何UDF，一个简单的窗口函数查询应该返回你想要的东西。

WITH x AS
(
 Select *
       ,ROW_NUMBER() OVER (PARTITION BY InvoiceNumber ORDER BY strInvoiceNo DESC) rn 
 FROM TableName
)
SELECT strInvoiceNo, InvoiceNumber, InvoiceString 
FROM X 
WHERE rn = 1

OR

SELECT strInvoiceNo, InvoiceNumber, InvoiceString 
FROM 
(
 Select *
       ,ROW_NUMBER() OVER (PARTITION BY InvoiceNumber ORDER BY strInvoiceNo DESC) rn 
 FROM TableName
)x
WHERE rn = 1

Answer 3

这是在LINQ中（假设fnStringFromNum返回一个用空格填充左边的字符串）：

dbContext.YOURTABLE
  .GroupBy(x=>UDFFunctions.fnNumbersFromStr(x.AccountNumber))
  .Select(x=>x.OrderByDescending(y=>UDFFunctions.fnStringFromNum(y.AccountNumber).FirstOrDefault())

SQL（使用当前fnStringFromNum）：

SELECT
  InvoiceNumber + LTRIM(MAX(RIGHT(SPACE(20)+InvoiceString,20))) As strInvoiceNo    
FROM
(
   SELECT
       dbo.fnNumbersFromStr(strInvoiceNo) AS [InvoiceNumber],
       dbo.fnStringFromNum(strInvoiceNo) AS [InvoiceString]
   FROM @TempTable
) As tbl
GROUP BY InvoiceNumber

Answer 4

不一定效率最高，但这可行：

select strInvoiceNo
from @TempTable T
where InvoiceString = (select max(invoicestring) from temp1 where invoicenumber = T.invoicenumber)
order by 1

编辑：抱歉......无视。这将取决于您的完整结果表，但可能不是您实际需要的。道歉。

如何仅获取最新的发票编号

4 个答案: