如何在Oracle12c XMLTYPE列中查找哪个列附加了哪个LOB？

下表中有两个XMLTYPE列（ERROR\u FLAG，COL\u XML）和一个LOB列（LOG\u TEXT）

CREATE TABLE APPLICATION_LOG
(
  ID                    NUMBER                  NOT NULL,
  LOG_TIME              TIMESTAMP(6)            NOT NULL,
  ERROR_FLAG            XMLTYPE,
  LOG_TEXT              CLOB,
  COL_XML               XMLTYPE,
  LOG_MESSAGETYPE       VARCHAR2(30 BYTE)       NOT NULL
)
XMLTYPE COL_XML STORE AS SECUREFILE BINARY XML (
  TABLESPACE users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  NOCACHE
  NOLOGGING)
ALLOW NONSCHEMA
DISALLOW ANYSCHEMA
LOB (LOG_TEXT) STORE AS BASICFILE (
  TABLESPACE  users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  PCTVERSION  10
  NOCACHE
  NOLOGGING)
NOCOMPRESS 
TABLESPACE users
;

如果我执行下面的查询，我会得到三行

CREATE TABLE APPLICATION_LOG
(
  ID                    NUMBER                  NOT NULL,
  LOG_TIME              TIMESTAMP(6)            NOT NULL,
  ERROR_FLAG            XMLTYPE,
  LOG_TEXT              CLOB,
  COL_XML               XMLTYPE,
  LOG_MESSAGETYPE       VARCHAR2(30 BYTE)       NOT NULL
)
XMLTYPE COL_XML STORE AS SECUREFILE BINARY XML (
  TABLESPACE users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  NOCACHE
  NOLOGGING)
ALLOW NONSCHEMA
DISALLOW ANYSCHEMA
LOB (LOG_TEXT) STORE AS BASICFILE (
  TABLESPACE  users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  PCTVERSION  10
  NOCACHE
  NOLOGGING)
NOCOMPRESS 
TABLESPACE users
;

SELECT * 
  FROM dba_lobs l 
 WHERE l.table_name  = 'APPLICATION_LOG'
   AND l.owner = 'SYSTEM'

CREATE TABLE APPLICATION_LOG
(
  ID                    NUMBER                  NOT NULL,
  LOG_TIME              TIMESTAMP(6)            NOT NULL,
  ERROR_FLAG            XMLTYPE,
  LOG_TEXT              CLOB,
  COL_XML               XMLTYPE,
  LOG_MESSAGETYPE       VARCHAR2(30 BYTE)       NOT NULL
)
XMLTYPE COL_XML STORE AS SECUREFILE BINARY XML (
  TABLESPACE users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  NOCACHE
  NOLOGGING)
ALLOW NONSCHEMA
DISALLOW ANYSCHEMA
LOB (LOG_TEXT) STORE AS BASICFILE (
  TABLESPACE  users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  PCTVERSION  10
  NOCACHE
  NOLOGGING)
NOCOMPRESS 
TABLESPACE users
;

如何确定第一个LOB是哪个XMLTYPE列（ERROR_FLAG或COL_XML），因为它们的名称现在是系统生成的？

---

如何找到SYS\u NC00004$--->对应于什么？

您可以通过使用

dba\u tab\u cols

字典视图来使用这种自联接

CREATE TABLE APPLICATION_LOG
(
  ID                    NUMBER                  NOT NULL,
  LOG_TIME              TIMESTAMP(6)            NOT NULL,
  ERROR_FLAG            XMLTYPE,
  LOG_TEXT              CLOB,
  COL_XML               XMLTYPE,
  LOG_MESSAGETYPE       VARCHAR2(30 BYTE)       NOT NULL
)
XMLTYPE COL_XML STORE AS SECUREFILE BINARY XML (
  TABLESPACE users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  NOCACHE
  NOLOGGING)
ALLOW NONSCHEMA
DISALLOW ANYSCHEMA
LOB (LOG_TEXT) STORE AS BASICFILE (
  TABLESPACE  users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  PCTVERSION  10
  NOCACHE
  NOLOGGING)
NOCOMPRESS 
TABLESPACE users
;

SELECT c2.data_type, c2.column_name, c1.data_type, c1.column_name
  FROM dba_tab_cols c1
  JOIN dba_tab_cols c2  
    ON c1.segment_column_id = c2.column_id  
   AND c1.table_name = c2.table_name 
   AND c2.data_type = 'XMLTYPE'
 WHERE c1.table_name = 'APPLICATION_LOG'

CREATE TABLE APPLICATION_LOG
(
  ID                    NUMBER                  NOT NULL,
  LOG_TIME              TIMESTAMP(6)            NOT NULL,
  ERROR_FLAG            XMLTYPE,
  LOG_TEXT              CLOB,
  COL_XML               XMLTYPE,
  LOG_MESSAGETYPE       VARCHAR2(30 BYTE)       NOT NULL
)
XMLTYPE COL_XML STORE AS SECUREFILE BINARY XML (
  TABLESPACE users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  NOCACHE
  NOLOGGING)
ALLOW NONSCHEMA
DISALLOW ANYSCHEMA
LOB (LOG_TEXT) STORE AS BASICFILE (
  TABLESPACE  users
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  PCTVERSION  10
  NOCACHE
  NOLOGGING)
NOCOMPRESS 
TABLESPACE users
;