/****** Object:  UserDefinedFunction [dbo].[Find_In_Set]    Script Date: 08/13/2025 12:30:04 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO


-- 创建自定义函数
create FUNCTION [dbo].[Find_In_Set] (@str NVARCHAR(255), @strlist NVARCHAR(MAX))
RETURNS INT
AS
BEGIN
    DECLARE @pos INT = 1;
    DECLARE @currentStr NVARCHAR(255);
    DECLARE @startPos INT = 1;
    DECLARE @endPos INT;

    WHILE @startPos <= LEN(@strlist)
    BEGIN
        SET @endPos = CHARINDEX(',', @strlist, @startPos);
        IF @endPos = 0
            SET @endPos = LEN(@strlist) + 1;

        SET @currentStr = SUBSTRING(@strlist, @startPos, @endPos - @startPos);
        IF @currentStr = @str
            RETURN @pos;

        SET @startPos = @endPos + 1;
        SET @pos = @pos + 1;
    END;

    RETURN 0;
END;


GO