oracle实现将汉字字符串转换成拼音首字母缩写

1、定义一个函数：

CREATE OR REPLACE FUNCTION F_GET_PYJM(P_NAME IN VARCHAR2) RETURN VARCHAR2 AS
  V_COMPARE VARCHAR2(100);
  V_RETURN  VARCHAR2(4000);
  /*创建人：gangma2
  创建时间：2020-08-21
  功能描述：任意字符串转换成拼音首字符简写，返回拼音简码函 */
BEGIN
  DECLARE
    --定义一个函数，通过NLSSORT来进行单个字符语言排序
    FUNCTION F_NLSSORT(P_WORD IN VARCHAR2) RETURN VARCHAR2 AS
    BEGIN
      RETURN NLSSORT(P_WORD, 'NLS_SORT=SCHINESE_PINYIN_M');
    END;
  BEGIN
    FOR I IN 1 .. LENGTH(P_NAME) LOOP
      --通过循环取每个字符，进行比较，确定该字符首字母拼音
      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
        --如果不能被转换返回原字符
        V_RETURN := V_RETURN || UPPER(SUBSTR(P_NAME, I, 1));
      END IF;
    END LOOP;
    RETURN LOWER(V_RETURN);
  END;
END;

2、调用函数，如：

转自：https://blog.youkuaiyun.com/mgxiaomage/article/details/108154918