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oracle函数获取汉字拼音的首字母

CREATE OR REPLACE FUNCTION F_TRANS_PINYIN_CAPITAL(P_NAME IN VARCHAR2) RETURN VARCHAR2 ASV_COMPARE VARCHAR2(100);V_RETURN VARCHAR2(4000);FUNCTION F_NLSSORT(P_WORD IN VARCHAR2) RETURN VARCHAR2 ASBEGINRETURN NLSSORT(P_WORD, ‘NLS_SORT=SCHINESE_PINYIN_M‘);END;BEGINFOR I IN 1..LENGTH(P_NAME) LOOP  V_COMPARE := F_NLSSORT(SUBSTR(P_NAME, I, 1));  IF V_COMPARE >= F_NLSSORT(‘ 吖 ‘) AND V_COMPARE <= F_NLSSORT(‘驁 ‘) THEN  V_RETURN := V_RETURN || ‘a‘;  ELSIF V_COMPARE >= F_NLSSORT(‘八 ‘) AND V_COMPARE <= F_NLSSORT(‘簿 ‘) THEN  V_RETURN := V_RETURN || ‘b‘;  ELSIF V_COMPARE >= F_NLSSORT(‘嚓 ‘) AND V_COMPARE <= F_NLSSORT(‘錯 ‘) THEN  V_RETURN := V_RETURN || ‘c‘;  ELSIF V_COMPARE >= F_NLSSORT(‘咑 ‘) AND V_COMPARE <= F_NLSSORT(‘鵽 ‘) THEN  V_RETURN := V_RETURN || ‘d‘;  ELSIF V_COMPARE >= F_NLSSORT(‘妸 ‘) AND V_COMPARE <= F_NLSSORT(‘樲 ‘) THEN  V_RETURN := V_RETURN || ‘e‘;  ELSIF V_COMPARE >= F_NLSSORT(‘发 ‘) AND V_COMPARE <= F_NLSSORT(‘猤 ‘) THEN  V_RETURN := V_RETURN || ‘f‘;  ELSIF V_COMPARE >= F_NLSSORT(‘旮 ‘) AND V_COMPARE <= F_NLSSORT(‘腂 ‘) THEN  V_RETURN := V_RETURN || ‘g‘;  ELSIF V_COMPARE >= F_NLSSORT(‘妎 ‘) AND V_COMPARE <= F_NLSSORT(‘夻 ‘) THEN  V_RETURN := V_RETURN || ‘h‘;  ELSIF V_COMPARE >= F_NLSSORT(‘丌 ‘) AND V_COMPARE <= F_NLSSORT(‘攈 ‘) THEN  V_RETURN := V_RETURN || ‘j‘;  ELSIF V_COMPARE >= F_NLSSORT(‘咔 ‘) AND V_COMPARE <= F_NLSSORT(‘穒 ‘) THEN  V_RETURN := V_RETURN || ‘k‘;  ELSIF V_COMPARE >= F_NLSSORT(‘垃 ‘) AND V_COMPARE <= F_NLSSORT(‘擽 ‘) THEN  V_RETURN := V_RETURN || ‘l‘;  ELSIF V_COMPARE >= F_NLSSORT(‘嘸 ‘) AND V_COMPARE <= F_NLSSORT(‘椧 ‘) THEN  V_RETURN := V_RETURN || ‘m‘;  ELSIF V_COMPARE >= F_NLSSORT(‘拏 ‘) AND V_COMPARE <= F_NLSSORT(‘瘧 ‘) THEN  V_RETURN := V_RETURN || ‘n‘;  ELSIF V_COMPARE >= F_NLSSORT(‘筽 ‘) AND V_COMPARE <= F_NLSSORT(‘漚 ‘) THEN  V_RETURN := V_RETURN || ‘o‘;  ELSIF V_COMPARE >= F_NLSSORT(‘妑 ‘) AND V_COMPARE <= F_NLSSORT(‘曝 ‘) THEN  V_RETURN := V_RETURN || ‘p‘;  ELSIF V_COMPARE >= F_NLSSORT(‘七 ‘) AND V_COMPARE <= F_NLSSORT(‘裠 ‘) THEN  V_RETURN := V_RETURN || ‘q‘;  ELSIF V_COMPARE >= F_NLSSORT(‘亽 ‘) AND V_COMPARE <= F_NLSSORT(‘鶸 ‘) THEN  V_RETURN := V_RETURN || ‘r‘;  ELSIF V_COMPARE >= F_NLSSORT(‘仨 ‘) AND V_COMPARE <= F_NLSSORT(‘蜶 ‘) THEN  V_RETURN := V_RETURN || ‘s‘;  ELSIF V_COMPARE >= F_NLSSORT(‘侤 ‘) AND V_COMPARE <= F_NLSSORT(‘籜 ‘) THEN  V_RETURN := V_RETURN || ‘t‘;  ELSIF V_COMPARE >= F_NLSSORT(‘屲 ‘) AND V_COMPARE <= F_NLSSORT(‘鶩 ‘) THEN  V_RETURN := V_RETURN || ‘w‘;  ELSIF V_COMPARE >= F_NLSSORT(‘夕 ‘) AND V_COMPARE <= F_NLSSORT(‘鑂 ‘) THEN  V_RETURN := V_RETURN || ‘x‘;  ELSIF V_COMPARE >= F_NLSSORT(‘丫 ‘) AND V_COMPARE <= F_NLSSORT(‘韻 ‘) THEN  V_RETURN := V_RETURN || ‘y‘;  ELSIF V_COMPARE >= F_NLSSORT(‘帀 ‘) AND V_COMPARE <= F_NLSSORT(‘咗 ‘) THEN  V_RETURN := V_RETURN || ‘z‘;  ELSE     V_RETURN := V_RETURN ||SUBSTR(P_NAME, I, 1);END IF;END LOOP;RETURN V_RETURN;END;

  

 SELECT F_TRANS_PINYIN_CAPITAL(‘中华人民共和国‘)  FROM DUAL