sqlserver取字符串拼音首字母

sqlserver 使用函数获取一个字符串的拼音首字母

create function dbo.fn_getpinyin(    @str nvarchar(max))returns nvarchar(max)asbegin    declare @word nchar(1),@PY nvarchar(max)    set @PY=''    while len(@str)>0    begin        set @word=left(@str,1)        --如果非汉字字符，返回原字符        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 @PYend