--database註釋
COMMENT ON DATABASE foodb IS '樣例數據庫';
--表註釋
COMMENT ON TABLE foo IS '樣例';
--sequence註釋
COMMENT ON SEQUENCE foo_seq IS '樣例';
--列明註釋
COMMENT ON COLUMN foo.foo_id IS 'ID';
COMMENT ON COLUMN foo.foo_name IS '姓名';
COMMENT ON COLUMN foo.foo_category IS '分類;
COMMENT ON COLUMN foo.foo_flg IS '標籤';
--註釋刪除
COMMENT ON COLUMN foo.foo_id IS NULL;