sql获取字符串中的中文

ALTER FUNCTION [dbo].[f_getchinese]
( 
	@chinese nvarchar(max)
)
RETURNS  nvarchar(100)
AS
BEGIN
  
  WHILE PATINDEX('%[^吖-座]%',@chinese) > 0
  -- SELECT 'Navicat for SQL Server'
  BEGIN
    SET @chinese = STUFF(@chinese,PATINDEX('%[^吖-座]%',@chinese),1,N'')
  END
  RETURN @chinese
END