获取中文名称的首字母的sql语句，用于获取中文名称的首字母

CREATE FUNCTION getPinYin (@str varchar(500) = '')
RETURNS varchar(500) AS

/*-------------------用于获取中文名称的首字母---------------------------------*/
BEGIN
Declare @strlen int,
@return varchar(500),
@ii int,
@c char(1),
@chn nchar(1)
--//初始化变量
Declare @pytable table(
chn char(2) COLLATE Chinese_PRC_CS_AS NOT NULL,
py char(1) COLLATE Chinese_PRC_CS_AS NULL,
PRIMARY KEY (chn)
)
insert into @pytable values('吖','A')
insert into @pytable values('八','B')
insert into @pytable values('嚓','C')
insert into @pytable values('