Oracle 数据字典查询

1.查询表的相关信息

select tt1.owner,
       tt1.table_name,
       tt1.comments,
       tt1.last_analyzed,
       tt1.num_rows,
       tt2.colcnt
  from (select t1.owner,
               t1.table_name,
               c1.comments,
               t1.last_analyzed,
               t1.num_rows
          from all_tables t1, ALL_TAB_COMMENTS c1
         where t1.owner = c1.owner
           and t1.table_name = c1.table_name) tt1,
       
       (select t5.OWNER, t5.TABLE_NAME, count(1) as colcnt
          from dba_tab_columns t5
         where t5.OWNER not in
               ('SYS', 'SYSTEM', 'OUTLN', 'DIP', 'ORACLE_OCM', 'DBSNMP',
                'APPQOSSYS', 'WMSYS', 'EXFSYS', 'CTXSYS', 'XDB', 'ANONYMOUS',
                'ORDSYS', 'ORDDATA', 'ORDPLUGINS', 'SI_INFORMTN_SCHEMA',
                'MDSYS', 'OLAPSYS', 'MDDATA', 'SPATIAL_WFS_ADMIN_USR',
                'SPATIAL_CSW_ADMIN_USR', 'SYSMAN', 'MGMT_VIEW', 'FLOWS_FILES',
                'APEX_PUBLIC_USER', 'APEX_030200', 'OWBSYS', 'OWBSYS_AUDIT',
                'SCOTT', 'HR', 'OE', 'IX', 'SH', 'PM', 'BI', 'XS$NULL')
         group by t5.OWNER, t5.TABLE_NAME) tt2
 where tt1.owner = tt2.owner
   and tt1.table_name = tt2.table_name
 order by tt1.owner, tt1.table_name

　　

2.查询字段相关信息