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COMMENT()			 SQL Commands			     COMMENT()

       COMMENT - define or change the comment of an object

	 TABLE object_name |
	 COLUMN table_name.column_name |
	 AGGREGATE agg_name (agg_type [, ...] ) |
	 CAST (sourcetype AS targettype) |
	 CONSTRAINT constraint_name ON table_name |
	 CONVERSION object_name |
	 DATABASE object_name |
	 DOMAIN object_name |
	 FUNCTION func_name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) |
	 INDEX object_name |
	 LARGE OBJECT large_object_oid |
	 OPERATOR op (leftoperand_type, rightoperand_type) |
	 OPERATOR CLASS object_name USING index_method |
	 [ PROCEDURAL ] LANGUAGE object_name |
	 ROLE object_name |
	 RULE rule_name ON table_name |
	 SCHEMA object_name |
	 SEQUENCE object_name |
	 TABLESPACE object_name |
	 TRIGGER trigger_name ON table_name |
	 TYPE object_name |
	 VIEW object_name
       } IS 'text'

       COMMENT stores a comment about a database object.

       To  modify  a comment, issue a new COMMENT command for the same object.
       Only one comment string is stored for each object.  To  remove  a  com‐
       ment,  write  NULL in place of the text string.	Comments are automati‐
       cally dropped when the object is dropped.

       Comments can be easily retrieved with the psql commands \dd,  \d+,  and
       \l+.   Other user interfaces to retrieve comments can be built atop the
       same  built-in  functions  that	psql  uses,  namely   obj_description,
       col_description, and shobj_description (see in the documentation).








	      The  name of the object to be commented. Names of tables, aggre‐
	      gates, domains, functions, indexes, operators, operator classes,
	      sequences, types, and views may be schema-qualified.

	      An input data type on which the aggregate function operates.  To
	      reference a zero-argument aggregate function, write *  in	 place
	      of the list of input data types.

	      The name of the source data type of the cast.

	      The name of the target data type of the cast.

	      The  mode	 of  a function argument: either IN, OUT, or INOUT. If
	      omitted, the default is IN.  Note that COMMENT ON FUNCTION  does
	      not  actually pay any attention to OUT arguments, since only the
	      input arguments are needed to determine the function's identity.
	      So it is sufficient to list the IN and INOUT arguments.

	      The  name of a function argument.	 Note that COMMENT ON FUNCTION
	      does not actually pay any attention  to  argument	 names,	 since
	      only  the	 argument data types are needed to determine the func‐
	      tion's identity.

	      The data type(s) of the function's arguments (optionally schema-
	      qualified), if any.

	      The OID of the large object.

	      This is a noise word.

       text   The  new	comment,  written as a string literal; or NULL to drop
	      the comment.

       There is presently no security mechanism for comments:  any  user  con‐
       nected to a database can see all the comments for objects in that data‐
       base (although only superusers can change  comments  for	 objects  that
       they  don't  own).  For	shared	objects	 such as databases, roles, and
       tablespaces comments are stored globally and any user connected to  any
       database	 can see all the comments for shared objects. Therefore, don't
       put security-critical information in comments.

       Attach a comment to the table mytable:

       COMMENT ON TABLE mytable IS 'This is my table.';

       Remove it again:

       COMMENT ON TABLE mytable IS NULL;

       Some more examples:

       COMMENT ON AGGREGATE my_aggregate (double precision) IS 'Computes sample variance';
       COMMENT ON CAST (text AS int4) IS 'Allow casts from text to int4';
       COMMENT ON COLUMN my_table.my_column IS 'Employee ID number';
       COMMENT ON CONVERSION my_conv IS 'Conversion to UTF8';
       COMMENT ON DATABASE my_database IS 'Development Database';
       COMMENT ON DOMAIN my_domain IS 'Email Address Domain';
       COMMENT ON FUNCTION my_function (timestamp) IS 'Returns Roman Numeral';
       COMMENT ON INDEX my_index IS 'Enforces uniqueness on employee ID';
       COMMENT ON LANGUAGE plpython IS 'Python support for stored procedures';
       COMMENT ON LARGE OBJECT 346344 IS 'Planning document';
       COMMENT ON OPERATOR ^ (text, text) IS 'Performs intersection of two texts';
       COMMENT ON OPERATOR - (NONE, text) IS 'This is a prefix operator on text';
       COMMENT ON OPERATOR CLASS int4ops USING btree IS '4 byte integer operators for btrees';
       COMMENT ON ROLE my_role IS 'Administration group for finance tables';
       COMMENT ON RULE my_rule ON my_table IS 'Logs updates of employee records';
       COMMENT ON SCHEMA my_schema IS 'Departmental data';
       COMMENT ON SEQUENCE my_sequence IS 'Used to generate primary keys';
       COMMENT ON TABLE my_schema.my_table IS 'Employee Information';
       COMMENT ON TABLESPACE my_tablespace IS 'Tablespace for indexes';
       COMMENT ON TRIGGER my_trigger ON my_table IS 'Used for RI';
       COMMENT ON TYPE complex IS 'Complex number data type';
       COMMENT ON VIEW my_view IS 'View of departmental costs';

       There is no COMMENT command in the SQL standard.

SQL - Language Statements	  2008-01-03			     COMMENT()
                             _         _         _ 
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                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
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