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Following up on my 2008 list of top cybersecurity threats, I have just published The Top Ten Cybersecurity Threats for 2009 for public comments. If you are interested in cybersecurity threats, kindly email your suggestions or comments directly to me (tim dot silkroad at gmail dot com). I will... (0 Replies)
COMMENT(7) SQL Commands COMMENT(7)NAME
COMMENT - define or change the comment of an object
SYNOPSIS
COMMENT ON
[
TABLE object_name |
COLUMN table_name.column_name |
AGGREGATE agg_name (agg_type) |
CONSTRAINT constraint_name ON table_name |
DATABASE object_name |
DOMAIN object_name |
FUNCTION func_name (arg1_type, arg2_type, ...) |
INDEX object_name |
OPERATOR op (leftoperand_type, rightoperand_type) |
RULE rule_name ON table_name |
SCHEMA object_name |
SEQUENCE object_name |
TRIGGER trigger_name ON table_name |
TYPE object_name |
VIEW object_name
] IS 'text'
INPUTS
object_name,
The name of the object to be be commented. Names of tables, aggregates, domains, functions, indexes, operators, sequences, types,
and views may be schema-qualified.
text The comment to add.
OUTPUTS
COMMENT
Message returned if the table is successfully commented.
DESCRIPTION
COMMENT stores a comment about a database object. Comments can be easily retrieved with psql's dd, d+, or l+ commands. Other user
interfaces to retrieve comments can be built atop the same built-in functions that psql uses, namely obj_description() and col_descrip-
tion().
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 automatically dropped when the object is dropped.
Note: There is presently no security mechanism for comments: any user connected to a database can see all the comments for objects
in that database (although only superusers can change comments for objects that they don't own). Therefore, don't put security-crit-
ical information in comments.
USAGE
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 COLUMN my_table.my_field IS 'Employee ID number';
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 OPERATOR ^ (text, text) IS 'Performs intersection of two texts';
COMMENT ON OPERATOR ^ (NONE, text) IS 'This is a prefix operator on text';
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 TRIGGER my_trigger ON my_table IS 'Used for R.I.';
COMMENT ON TYPE complex IS 'Complex Number datatype';
COMMENT ON VIEW my_view IS 'View of departmental costs';
COMPATIBILITY
SQL92
There is no COMMENT in SQL92.
SQL - Language Statements 2002-11-22 COMMENT(7)