Oracle uses comment statements to add Table Comments

Source: Internet
Author: User

Oracle uses comment statements to add Table Comments
The oracle comment statement can be used to add remarks to tables, fields, views, and other objects.


Syntax:
Comment on TABLE table_name IS 'Remarks ';


Permission requirements:
By default, users can only add comments to their own objects.
If you want to add comments to other user objects, you must have the following permissions:COMMENT ANY TABLE


Related Data Field View:
USER_TAB_COMMENTS
DBA_TAB_COMMENTS
ALL_TAB_COMMENTS
USER_COL_COMMENTS
DBA_COL_COMMENTS
ALL_COL_COMMENTS


Example:
Drop table t;
Create table t (id number );


Select * from user_tab_comments;


TABLE_NAME TABLE_TYPE COMMENTS
------------------------------------------------------------------------------------------
T TABLE


Select * from USER_COL_COMMENTS;


SCOTT @ orcl> select * from USER_COL_COMMENTS WHERE table_name = 'T ';


TABLE_NAME COLUMN_NAME COMMENTS
------------------------------------------------------------------------------------------
T ID




-- Add comments
SCOTT @ orcl> comment on table t is 'test table T ';


Note created.


SCOTT @ orcl> comment on column t. id is 'row id ';


Note created.


SCOTT @ orcl> select * from user_tab_comments WHERE table_name = 'T ';


TABLE_NAME TABLE_TYPE COMMENTS
------------------------------------------------------------------------------------------
T table test TABLE T


SCOTT @ orcl> select * from USER_COL_COMMENTS WHERE table_name = 'T ';


TABLE_NAME COLUMN_NAME COMMENTS
------------------------------------------------------------------------------------------
T id row ID

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