???????????????????????????????????????????????????????? ???????????????????????????????? ????????????????????????????????????????????????????? ?????????????????????????? ???????????????? ?????????????????????????????????????? ??????????????? ???????? ?????????????????????????????? ????????????????????? ????????????????? ??????????????????? ???????

For the majority of relations The end result is similar to pg_class.relfilenode, but for specific technique catalogs relfilenode is zero and this functionality must be utilized to get the proper worth. The purpose returns NULL if handed a relation that doesn't have storage, for instance a view.??????? pg ????????????????????????????????????????????