使用标识列更新表的主索引

Question

是否可以更改包含现有数据且具有标识列的Teradata表的唯一主索引/主索引？在保留标识列中当前使用的值的同时，最好的方法是什么？

这是当前表DDL：

CREATE MULTISET TABLE AUDIT.AUDIT_DATA_QUALITY_INDICATOR, NO FALLBACK,
     NO BEFORE JOURNAL,
     NO AFTER JOURNAL,
     CHECKSUM = DEFAULT,
     DEFAULT MERGEBLOCKRATIO(
      DATA_QUALITY_INDICATOR_KEY INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY(
            START WITH 1
            INCREMENT BY 1
            MINVALUE -2147483647
            MAXVALUE 2147483647
            NO CYCLE)
      ,DATA_QUALITY_INDICATOR VARCHAR(100) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,DATA_QUALITY_INDICATOR_DESCRIPTION VARCHAR(1000) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,DATA_QUALITY_INDICATOR_TYPE_KEY INTEGER
      ,DATA_QUALITY_INDICATOR_DEFAULT_BATCH_OWNER VARCHAR(100) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,DATA_QUALITY_INDICATOR_EXECUTION_ORDER INTEGER NOT NULL
      ,FLAG_DATA_QUALITY_INDICATOR_ACTIVE VARCHAR(12) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL DEFAULT 'INACTIVE'
      ,SCRIPT_NAME VARCHAR(500) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,FUNCTION_NAME VARCHAR(500) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,ALERT_THRESHOLD VARCHAR(50) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,ALERT_DISTRIBUTION_LIST VARCHAR(1000) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,SUBJECT_AREA_KEY SMALLINT NOT NULL
      ,CREATION_DATE TIMESTAMP(6) NOT NULL
      ,LAST_UPDATE TIMESTAMP(6) NOT NULL
      ,AUDIT_PROCESS_KEY INTEGER NOT NULL DEFAULT 1
      ,SPACE_ID VARCHAR(50) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL DEFAULT 'ND'
,FOREIGN KEY ( DATA_QUALITY_INDICATOR_TYPE_KEY ) REFERENCES WITH NO CHECK OPTION AUDIT.AUDIT_DATA_QUALITY_INDICATOR_TYPE ( DATA_QUALITY_INDICATOR_TYPE_KEY )
,FOREIGN KEY ( AUDIT_PROCESS_KEY ) REFERENCES WITH NO CHECK OPTION AUDIT.AUDIT_PROCESS ( AUDIT_PROCESS_KEY )
,FOREIGN KEY ( SUBJECT_AREA_KEY ) REFERENCES WITH NO CHECK OPTION EDW.DIM_SUBJECT_AREA ( SUBJECT_AREA_KEY )
)
UNIQUE PRIMARY INDEX UPI_AUDIT_DATA_QUALITY_INDICATOR ( DATA_QUALITY_INDICATOR_KEY );

我想将其更改为：

CREATE MULTISET TABLE AUDIT.AUDIT_DATA_QUALITY_INDICATOR, NO FALLBACK,
     NO BEFORE JOURNAL,
     NO AFTER JOURNAL,
     CHECKSUM = DEFAULT,
     DEFAULT MERGEBLOCKRATIO(
      DATA_QUALITY_INDICATOR_KEY INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY(
            START WITH 1
            INCREMENT BY 1
            MINVALUE -2147483647
            MAXVALUE 2147483647
            NO CYCLE)
      ,DATA_QUALITY_INDICATOR VARCHAR(100) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,DATA_QUALITY_INDICATOR_DESCRIPTION VARCHAR(1000) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,DATA_QUALITY_INDICATOR_TYPE_KEY INTEGER
      ,DATA_QUALITY_INDICATOR_DEFAULT_BATCH_OWNER VARCHAR(100) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,DATA_QUALITY_INDICATOR_EXECUTION_ORDER INTEGER NOT NULL
      ,FLAG_DATA_QUALITY_INDICATOR_ACTIVE VARCHAR(12) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL DEFAULT 'INACTIVE'
      ,SCRIPT_NAME VARCHAR(500) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,FUNCTION_NAME VARCHAR(500) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,ALERT_THRESHOLD VARCHAR(50) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,ALERT_DISTRIBUTION_LIST VARCHAR(1000) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL
      ,SUBJECT_AREA_KEY SMALLINT NOT NULL
      ,CREATION_DATE TIMESTAMP(6) NOT NULL
      ,LAST_UPDATE TIMESTAMP(6) NOT NULL
      ,AUDIT_PROCESS_KEY INTEGER NOT NULL DEFAULT 1
      ,SPACE_ID VARCHAR(50) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL DEFAULT 'ND'
,FOREIGN KEY ( DATA_QUALITY_INDICATOR_TYPE_KEY ) REFERENCES WITH NO CHECK OPTION AUDIT.AUDIT_DATA_QUALITY_INDICATOR_TYPE ( DATA_QUALITY_INDICATOR_TYPE_KEY )
,FOREIGN KEY ( AUDIT_PROCESS_KEY ) REFERENCES WITH NO CHECK OPTION AUDIT.AUDIT_PROCESS ( AUDIT_PROCESS_KEY )
,FOREIGN KEY ( SUBJECT_AREA_KEY ) REFERENCES WITH NO CHECK OPTION EDW.DIM_SUBJECT_AREA ( SUBJECT_AREA_KEY )
)
UNIQUE PRIMARY INDEX UPI_AUDIT_DATA_QUALITY_INDICATOR ( DATA_QUALITY_INDICATOR, SPACE_ID );