GNU/Linux |
CentOS 2.1AS(Slurm) |
|
comment(l) |
COMMENT − Add comment to an object
COMMENT ON
[
[ DATABASE | INDEX | RULE | SEQUENCE | TABLE | TYPE | VIEW ]
object_name |
COLUMN table_name.column_name|
AGGREGATE agg_name agg_type|
FUNCTION func_name (arg1, arg2, ...)|
OPERATOR op (leftoperand_type
rightoperand_type) |
TRIGGER trigger_name ON table_name
] IS ’text’
INPUTS
object_name, table_name,
The name of the object to be be commented.
text |
The comment to add. |
OUTPUTS
COMMENT
Message returned if the table is successfully commented.
COMMENT adds a comment to an object that can be easily retrieved with psql’s \dd, \d+, or \l+ commands. To remove a comment, use NULL. Comments are automatically dropped when the object is dropped.
Comment the table mytable:
COMMENT ON mytable IS ’This is my table.’;
Some more examples:
COMMENT ON
DATABASE my_database IS ’Development Database’;
COMMENT ON INDEX my_index IS ’Enforces uniqueness on
employee id’;
COMMENT ON RULE my_rule IS ’Logs UPDATES of employee
records’;
COMMENT ON SEQUENCE my_sequence IS ’Used to generate
primary keys’;
COMMENT ON TABLE my_table IS ’Employee
Information’;
COMMENT ON TYPE my_type IS ’Complex Number
support’;
COMMENT ON VIEW my_view IS ’View of departmental
costs’;
COMMENT ON COLUMN my_table.my_field IS ’Employee ID
number’;
COMMENT ON AGGREGATE my_aggregate (double precision) IS
’Computes sample variance’;
COMMENT ON FUNCTION my_function (timestamp) IS
’Returns Roman Numeral’;
COMMENT ON OPERATOR ^ (text, text) IS ’Performs
intersection of two text’;
COMMENT ON TRIGGER my_trigger ON my_table IS ’Used for
R.I.’;
SQL92
There is no COMMENT in SQL92.
comment(l) |