MS SQL 字元拆分存處理

MS SQL Server沒有split()函數，但是我們可以寫一個Table-valued Functions定義函數[dbo].[udf_SplitStringToTable] ：

CREATE FUNCTION [dbo].[udf_SplitStringToTable] 
( 
    @string NVARCHAR(MAX), 
    @delimiter CHAR(1) 
) 
RETURNS @result TABLE([ID] INT IDENTITY(1,1),value NVARCHAR(MAX) 
) 
BEGIN 
    DECLARE @start INT, @end INT 
    SELECT @start = 1, @end = CHARINDEX(@delimiter, @string) 
    WHILE @start < LEN(@string) + 1 
    BEGIN 
        IF @end = 0  
            SET @end = LEN(@string) + 1
       
        INSERT INTO @result (value) VALUES (SUBSTRING(@string, @start, @end - @start)) 
        SET @start = @end + 1 
        SET @end = CHARINDEX(@delimiter, @string, @start)        
    END 
    RETURN 
END

再寫另外一個Scalar-valued Function自定義函數[dbo].[udf_SplitString]:

CREATE FUNCTION [dbo].[udf_SplitString]
(
    @string NVARCHAR(MAX), 
    @delimiter CHAR(1),
    @index INT
)
RETURNS NVARCHAR(MAX)
AS
BEGIN
    DECLARE @rtn NVARCHAR(MAX)
    SELECT @rtn = [value] FROM [dbo].[udf_SplitStringToTable] (@string,@delimiter) WHERE [ID] = @index
    RETURN @rtn
END
GO

上面代碼示例中@index參數即是你想獲取第幾個字元串，舉個例子吧：