一、該函數(shù)傳入字符串，返回?cái)?shù)據(jù)為：如果為漢字字符，返回該字符的首字母，如果為非漢字字符，則返回本身。
二、用到的知識(shí)點(diǎn)：漢字對(duì)應(yīng)的UNICODE值，漢字的排序規(guī)則。
三、數(shù)據(jù)庫(kù)函數(shù)：

CREATE FUNCTION GetInitialLetter(@ChineseString NVARCHAR(4000)) RETURNS NVARCHAR(4000) AS BEGINDECLARE @SingleCharacter NCHAR(1), @ReturnString NVARCHAR(4000) SET @ReturnString = '' WHILE LEN(@ChineseString)>0 BEGIN--依次取單個(gè)字符 SET @SingleCharacter = LEFT(@ChineseString,1) ----漢字字符，返回字符對(duì)應(yīng)首字母,非漢字字符,返回原字符 IF(UNICODE(@SingleCharacter) BETWEEN 19968 AND 19968+20901) SET @ReturnString = @ReturnString + (SELECT TOP 1 PY FROM (SELECT 'A' AS PY,N'驁' AS ChineseCharacters UNION All SELECT 'B',N'簿' UNION All SELECT 'C',N'錯(cuò)' 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' )SpellingTable where ChineseCharacters > = @SingleCharacter COLLATE Chinese_PRC_CS_AS_KS_WS ORDER by PY ASC) ELSE SET @ReturnString = @ReturnString + @SingleCharacterSET @ChineseString = RIGHT(@ChineseString,LEN(@ChineseString)-1) ENDRETURN @ReturnString END GO

SELECT dbo.GetInitialLetter('加油2018')

返回：JY2018

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