字符串分隔（转自别处）

CREATE FUNCTION [dbo].[GetSplitOfIndex]
(
      @String NVARCHAR(MAX) ,  --要分割的字符串
      @split NVARCHAR(10) ,  --分隔符号
      @index INT --取第几个元素
)
RETURNS NVARCHAR(1024)
AS
    BEGIN
        DECLARE @location INT
        DECLARE @start INT
        DECLARE @next INT
        DECLARE @seed INT
 
        SET @String = LTRIM(RTRIM(@String))
        SET @start = 1
        SET @next = 1
        SET @seed = LEN(@split)
 
        SET @location = CHARINDEX(@split, @String)
        WHILE @location <> 0
            AND @index > @next
            BEGIN
                SET @start = @location + @seed
                SET @location = CHARINDEX(@split, @String, @start)
                SET @next = @next + 1
            END
        IF @location = 0
            SELECT  @location = LEN(@String) + 1
 
        RETURN SUBSTRING(@String,@start,@location-@start)
    END