--函数如下：
/*
CREATE FUNCTION dbo.fnpbGetPYFirstLetter
(
@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)
--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 @PY
END
*/
调用示例：
--City PinYin
select dbo.fnpbGetPYFirstLetter('上海市')
Result: "SHS"
