Sql server如何得到漢字的聲母

在sql中建立使用者自訂拼音函數：
create function f_GetPy(@Str nvarchar(400))
returns nvarchar(4000)
as
begin
declare @strlen int,@re nvarchar(4000)
declare @t table(chr nchar(1) collate Chinese_PRC_CI_AS,letter nchar(1))
insert @t select '吖','A' union all select '八','B'
union all select '嚓','C' union all select '咑','D'
union all select '妸','E' union all select '發','F'
union all select '旮','G' union all select '鉿','H'
union all select '丌','J' union all select '哢','K'
union all select '垃','L' union all select '嘸','M'
union all select '拏','N' union all select '噢','O'
union all select '妑','P' union all select '七','Q'
union all select '呥','R' union all select '仨','S'
union all select '他','T' union all select '屲','W'
union all select '夕','X' union all select '丫','Y'
union all select '帀','Z'

select @strlen=len(@str),@re=''
while @strlen>0
begin
select top 1 @re=letter+@re,@strlen=@strlen-1
from @t a where chr<=substring(@str,@strlen,1)
order by chr desc
if @@rowcount=0
select @re=substring(@str,@strlen,1)+@re,@strlen=@strlen-1
end
return(@re)
end
go
--測試
select dbo.f_GetPy('東莞市') as 東莞市,dbo.f_GetPy('ab中c國人') as 中國人

--以後查詢的時候,就可以調用上面的函數來實現漢字模糊查詢

select * from 表 where dbo.f_getpy(欄位)='zgyh'