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
)