oracle 查询字段明细等

select column_name,data_type,data_length
from all_tab_columns where table_name='T_CAKEY'

 

select * from user_tables --查询当前用户所拥有的表

select * from dba_tables --拥有DBA权限用户能查询所有的表

select * from all_tables --查询当前用户能访问的表

查询表字段明细

select column_name,data_type,data_length,DATA_PRECISION ,DATA_SCALE

from all_tab_columns where table_name='tablename'

字段注释

select   *   from   user_col_comments;

表注释

select   *   from   user_tab_comments;

表明细+表注释+字段明细+字段注释

select ATC.OWNER,atC.TABLE_NAME,utc.comments,ATC.COLUMN_NAME,ATC.DATA_TYPE,ATC.DATA_LENGTH,ATC.NULLABLE, ucc.comments from

(select ATC.OWNER,atC.TABLE_NAME,ATC.COLUMN_NAME,ATC.DATA_TYPE,ATC.DATA_LENGTH,ATC.NULLABLE

from all_tab_columns ATC where ATC.owner in (用戶名1，用戶名2........) ) atc

left outer join user_col_comments ucc on atc.table_name=ucc.table_name and atc.column_name=ucc.column_name

left outer join user_tab_comments utc on atc.table_name=utc.table_name

order by atc.table_name,atc.column_name;