SQL函数取汉字拼音首字母

 CREATE function f_GetFirstPy(@str varchar(50)='')
     returns char(1)
 as
 begin
     declare @n int, @c char(1), @chn nchar(1)
     select @n=63, @chn=substring(@str,1,1)
     if @chn > 'z'
         if( @chn < '八' ) set @c = 'A'
         else if ( @chn < '嚓' ) set @c = 'B'
         else if ( @chn < '咑' ) set @c = 'C'
         else if ( @chn < '妸' ) set @c = 'D'
         else if ( @chn < '发' ) set @c = 'E'
         else if ( @chn < '旮' ) set @c = 'F'
         else if ( @chn < '铪' ) set @c = 'G'
         else if ( @chn < '丌' ) set @c = 'H'
         else if ( @chn < '丌' ) set @c = 'I'
         else if ( @chn < '咔' ) set @c = 'J'
         else if ( @chn < '垃' ) set @c = 'K'
         else if ( @chn < '嘸' ) set @c = 'L'
         else if ( @chn < '拏' ) set @c = 'M'
         else if ( @chn < '噢' ) set @c = 'N'
         else if ( @chn < '妑' ) set @c = 'O'
         else if ( @chn < '七' ) set @c = 'P'
         else if ( @chn < '呥' ) set @c = 'Q'
         else if ( @chn < '仨' ) set @c = 'R'
         else if ( @chn < '他' ) set @c = 'S'
         else if ( @chn < '屲' ) set @c = 'T'
         else if ( @chn < '屲' ) set @c = 'U'
         else if ( @chn < '屲' ) set @c = 'V'
         else if ( @chn < '夕' ) set @c = 'W'
         else if ( @chn < '丫' ) set @c = 'X'
         else if ( @chn < '帀' ) set @c = 'Y'
         else set @c = 'Z'
     else if @chn <= 'z' and @chn >= 'a'
         set @c = upper(@chn)
     else if @chn <= 'Z' and @chn >= 'A'
         set @c = @chn
     else
         set @c = ''
     return (@c)
 end