查找傳遞逗號分隔的整數作爲字符串中的存儲過程

Question

String = '45,12,37,89,10,107,64,97' 

創建需要逗號分隔值的程序最大值，我們可以說數字的排列，找到 最大的價值。

Answer 1

您可以按照以下步驟操作。

創建一個函數來提取數據

CREATE FUNCTION [dbo].[fnSplitString] 
(
     @str as varchar(max), 
     @delimiter as varchar(1) 
) 
RETURNS @TableReturn table(ID integer) 
AS 
BEGIN 
    IF (@str IS NULL or @str ='') 
     BEGIN 
       INSERT INTO @TableReturn SELECT 0 
     END 
    ELSE 
     WHILE (charindex(@delimiter,@str)>0) 
     BEGIN 
      INSERT INTO @TableReturn 
      SELECT SUBSTRING (@str,1,charindex(@delimiter,@str)-1) 
      SET @str = SUBSTRING (@str,charindex(@delimiter,@str)+1, len(@str)) 
     END 
     IF (@str <> '' and @str <> ',') 
     BEGIN 
      INSERT INTO @TableReturn SELECT @str 
     END 
    RETURN 
END 

然後調用它：

SELECT TOP(1)* FROM dbo.fnSplitString('45,12,37,89,10,107,64,97', ',') ORDER BY ID DESC 

要不然：

SELECT MAX(ID) FROM dbo.fnSplitString('45,12,37,89,10,107,64,97', ',') 

Answer 2

我有這樣的方法書籤。不記得來源，但它的作用就像魅力。已經爲你修改它。請嘗試：

Create table #Testdata(Data varchar(max)) 
Insert #Testdata select '45,12,37,89,10,107,64' 


;with tmp(DataItem, Data) as (
select LEFT(Data, CHARINDEX(',',Data+',')-1), 
     STUFF(Data, 1, CHARINDEX(',',Data+','), '') 
from #Testdata 
union all 
select LEFT(Data, CHARINDEX(',',Data+',')-1), 
     STUFF(Data, 1, CHARINDEX(',',Data+','), '') 
from tmp 
where Data > '' 
) 
select max(cast(DataItem as int)) 
from tmp 
OPTION (maxrecursion 0)