COMMENT_ON  ─┬─> 
D
O
M
A
I
N domain-name ────┬─> 
I
S typebox (')string' ;
              ├─> 
C
O
L
U
M
N column-name ────┤
              ├─> 
T
A
B
L
E table-name ──────┤
              └─> 
I
N
D
E
X index-name ──────┘

Additional information available:

More Information

 The COMMENT ON statement adds or changes a comment about a domain,
 table, or column.  The comment is added to a table definition or
 replaces an existing comment in a table definition.  If you specify a
 column in the COMMENT ON statement, you must qualify the column name
 with a table name.

 You cannot create comments for view definitions.

 You cannot specify the COMMENT ON statement within a CREATE DATABASE
 statement.