oracle 得到一个表的表结构

SELECT OWNER,
         TABLE_NAME,
         COLUMN_NAME,
         DATA_TYPE
         || DECODE (
               DATA_TYPE,
               'NUMBER', DECODE (
                               '('
                            || NVL (TO_CHAR (DATA_PRECISION), '*')
                            || ','
                            || NVL (TO_CHAR (DATA_SCALE), '*')
                            || ')',
                            '(*,*)', NULL,
                            '(*,0)', '(38)',
                               '('
                            || NVL (TO_CHAR (DATA_PRECISION), '*')
                            || ','
                            || NVL (TO_CHAR (DATA_SCALE), '*')
                            || ')'),
               'FLOAT', '(' || DATA_PRECISION || ')',
               'DATE', NULL,
               'TIMESTAMP(6)', NULL,
               '(' || DATA_LENGTH || ')')
            AS DATA_TYPE,
         DATA_LENGTH,
         NULLABLE
    FROM DBA_TAB_COLUMNS
   WHERE OWNER IN ('GCE_DB2')
         AND TABLE_NAME = UPPER ('CCADCM')
ORDER BY OWNER, TABLE_NAME, COLUMN_ID;






SELECT TABLE_NAME||'  '||COLUMN_NAME||'  '||COLUMN_ID|| ' '  ||  DECODE(DATA_TYPE, 'CHAR' , 'VARCHAR2', 'TIMESTAMP(6)' ,'TIMESTAMP', DATA_TYPE ) ||DECODE (
               DATA_TYPE,
               'NUMBER', DECODE (
                               '('
                            || NVL (TO_CHAR (DATA_PRECISION), '*')
                            || ','
                            || NVL (TO_CHAR (DATA_SCALE), '*')
                            || ')',
                            '(*,*)', NULL,
                            '(*,0)', '(38)',
                               '('
                            || NVL (TO_CHAR (DATA_PRECISION), '*')
                            || ','
                            || NVL (TO_CHAR (DATA_SCALE), '*')
                            || ')'),
               'FLOAT', '(' || DATA_PRECISION || ')',
               'DATE', NULL,
               'TIMESTAMP(6)', NULL,
               '(' || DATA_LENGTH || ')')  ||'  '|| NULLABLE
    FROM DBA_TAB_COLUMNS
   WHERE OWNER IN ('GCE_DB2')
         AND TABLE_NAME = UPPER ('RDMDCM')
ORDER BY OWNER, TABLE_NAME, COLUMN_ID;


SELECT TABLE_NAME||CHR(9)||COLUMN_NAME||CHR(9)||COLUMN_ID||CHR(9)||  DECODE(DATA_TYPE, 'CHAR' , 'VARCHAR2', 'TIMESTAMP(6)' ,'TIMESTAMP', DATA_TYPE ) ||DECODE (
                DATA_TYPE,
               'NUMBER', DECODE (
                               '('
                            || NVL (TO_CHAR (DATA_PRECISION), '*')
                            || ','
                            || NVL (TO_CHAR (DATA_SCALE), '*')
                            || ')',
                            '(*,*)', NULL,
                            '(*,0)', '(38)',
                               '('
                            || NVL (TO_CHAR (DATA_PRECISION), '*')
                            || ','
                            || NVL (TO_CHAR (DATA_SCALE), '*')
                            || ')'),
               'FLOAT', '(' || DATA_PRECISION || ')',
               'DATE', NULL,
               'TIMESTAMP(6)', NULL,
               '(' || DATA_LENGTH || ')')  ||CHR(9)|| NULLABLE
    FROM DBA_TAB_COLUMNS
   WHERE OWNER IN ('GCE_DB2')
         AND TABLE_NAME = UPPER ('RDMDCM')
ORDER BY OWNER, TABLE_NAME, COLUMN_ID;