oracle 自定义聚合函数（按字段分组，非分组字段进行合并）

按字段进行分组，没分组字段通过函数进行字符串的合并，用','分割

CREATE OR REPLACE FUNCTION zh_concat(P1 VARCHAR2) RETURN clob AGGREGATE USING zh_concat_im;
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CREATE OR REPLACE TYPE BODY zh_concat_im IS
  STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT zh_concat_im)
    RETURN NUMBER IS
  BEGIN
    SCTX := zh_concat_im(NULL);
    RETURN ODCICONST.SUCCESS;
  END;
  MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT zh_concat_im,
                                       P1   IN VARCHAR2) RETURN NUMBER IS
  BEGIN
    IF (CURR_STR IS NOT NULL) THEN
      CURR_STR := CURR_STR || ',' || P1;
    ELSE
      CURR_STR := P1;
    END IF;
    RETURN ODCICONST.SUCCESS;
  END;
  MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF        IN zh_concat_im,
                                         RETURNVALUE OUT clob,
                                         FLAGS       IN NUMBER) RETURN NUMBER IS
  BEGIN
    RETURNVALUE := CURR_STR;
    RETURN ODCICONST.SUCCESS;
  END;
  MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF  IN OUT zh_concat_im,
                                     SCTX2 IN zh_concat_im) RETURN NUMBER IS
  BEGIN
    IF (SCTX2.CURR_STR IS NOT NULL) THEN
      SELF.CURR_STR := SELF.CURR_STR || ',' || SCTX2.CURR_STR;
    END IF;
    RETURN ODCICONST.SUCCESS;
  END;
END;


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CREATE OR REPLACE TYPE "ZH_CONCAT_IM"
AUTHID CURRENT_USER AS OBJECT
(
  CURR_STR clob,
  STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT zh_concat_im)
    RETURN NUMBER,
  MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT zh_concat_im,
                                       P1   IN VARCHAR2) RETURN NUMBER,
  MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF        IN zh_concat_im,
                                         RETURNVALUE OUT clob,
                                         FLAGS       IN NUMBER)
    RETURN NUMBER,
  MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF  IN OUT zh_concat_im,
                                     SCTX2 IN zh_concat_im) RETURN NUMBER
)