Ubuntu manuals

Provided by: manpages-zh_1.5.2-1_all

NAME

       COMMENT -

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'

DESCRIPTION

       COMMENT      psql     \dd,   \d+,    \l+     psql     obj_description()
       col_description()

         COMMENT   NULL

PARAMETERS

       object_name

       table_name.column_name

       aggname

       constraint_name

       func_name

       op

       rule_name

       trigger_name

       agg_type
               *

       large_object_oid
               OID

       PROCEDURAL

       sourcetype

       targettype

       text

NOTES

EXAMPLES

        mytable

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

       COMMENT ON TABLE mytable IS NULL;

       COMMENT ON AGGREGATE my_aggregate (double precision) IS 'Computes sample variance';
       COMMENT ON COLUMN my_table.my_column 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 RI';
       COMMENT ON TYPE complex IS 'Complex number data type';
       COMMENT ON VIEW my_view IS 'View of departmental costs';

COMPATIBILITY

       SQL COMMENT

       Postgresql  <laser@pgsqldb.org>