PostgreSQL 8.0.0 �����ĵ���PostgreSQL �й� ������ | ||||
---|---|---|---|---|
Prev | Fast Backward | Fast Forward | Next |
COMMENT ON { 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 (arg1_type, arg2_type, ...) | 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 | 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'
COMMENT �洢һ�����ݿ�������ע��
Ҫ��һ����ע��Ϊͬһ������һ���µ� COMMENT ����ɡ�ÿ������ֻ�洢һ����ע�� Ҫɾ����ע�����ı��ִ���λ��д�� NULL�� ��ɾ������ʱ����ע�Զ���ɾ������
��ע������ psql ���� \dd�� \d+���� \l+ ������ ����ϣ��������ע���û��ӿڿ��Խ����� psql ʹ�õ�ͬ�������ú����ϣ� Ҳ����˵ obj_description �� col_description ������ Table 9-43����
Ҫ������ע�Ķ������ơ������������У���ͼ�����ͣ������� �ۼ��Ͳ����������ֿ�����ģʽ���εġ�
�ۼ������IJ������ͣ�����������������������ͣ���ô�� *��
������ OID��
��������á�
����ת����Դ�����������֡�
����ת����Ŀ�������������֡�
�µ���ע�����ִ��ı��ķ�ʽд������� NULL ��ɾ������ע��
һ�����ݿ������עֻ���ڸ����ݿ��ﴴ��������ֻ�����Ǹ����ݿ���ɼ����������ﲻ�ɼ���
��Ҫ˵������Ŀǰ��עû�а�ȫ���ƣ��κ����ӵ�ij���ݿ��ϵ��û������Կ������и����ݿ�������ע ������ֻ�г����û������IJ��������Ķ������ע������ˣ���Ҫ����ע��Ű�ȫ�����е���Ϣ��
����mytable ����ע��
COMMENT ON mytable IS 'This is my table.';
��ɾ������
COMMENT ON TABLE mytable IS NULL;
һЩ���ӣ�
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 Unicode'; 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 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';