SQL SERVER 取字符串的首字母

SQL SERVER 取字符串的首字母

if exists(select 1 from sysobjects where name='yh_fn_get_py' and xtype = 'FN')

  drop function yh_fn_get_py
go


create function yh_fn_get_py(@str nvarchar(4000))  returns nvarchar(4000) 
with encryption
as  
begin  
declare @word nchar(1),@PY nvarchar(4000)  
set @PY=''  
while len(@str)>0  
begin  
set @word=left(@str,1)  
set @PY=@PY+(case when unicode(@word) between 19968 and 19968+20901  then 
   (select top 1 PY 
  from (select 'A' as PY,N'驁' as word 
    union all select 'B',N'簿'  
    union all select 'C',N'錯'  
union all select 'D',N'鵽'  
union all select 'E',N'樲'  
union all select 'F',N'鰒'  
union all select 'G',N'腂'  
union all select 'H',N'夻'  
union all select 'J',N'攈'  
union all select 'K',N'穒' 
union all select 'L',N'鱳'  
union all select 'M',N'旀'  
union all select 'N',N'桛'  
union all select 'O',N'漚'  
union all select 'P',N'曝'  
union all select 'Q',N'囕'  
union all select 'R',N'鶸'  
union all select 'S',N'蜶'  
union all select 'T',N'籜'  
union all select 'W',N'鶩'  
union all select 'X',N'鑂'  
union all select 'Y',N'韻'  
union all select 'Z',N'咗'  ) T 
  where word>=@word collate Chinese_PRC_CS_AS_KS_WS  order by PY ASC) 
else @word end) 
set @str=right(@str,len(@str)-1) 
end  
return @PY  
end