背景
當使用資料庫分割槽或繼承功能，在PK層面上出現分割槽與分割槽，或分割槽與主表出現了重複的鍵值時，可以通過tableoid進行甄別，同時通過ONLY TABLE的操作方法進行刪除。

select tableoid::regclass

delete|select|update|truncate only 
例子
建立測試表、繼承分割槽，PK約束在獨立的分割槽或主表上

postgres=# create table p (id int primary key, info text, crt_time timestamp); 
CREATE TABLE 
postgres=# create table p0 (like p including all) inherits(p); 
NOTICE: merging column "id" with inherited definition 
NOTICE: merging column "info" with inherited definition 
NOTICE: merging column "crt_time" with inherited definition 
CREATE TABLE 
postgres=# create table p1 (like p including all) inherits(p); 
NOTICE: merging column "id" with inherited definition 
NOTICE: merging column "info" with inherited definition 
NOTICE: merging column "crt_time" with inherited definition 
CREATE TABLE 
postgres=# create table p2 (like p including all) inherits(p); 
NOTICE: merging column "id" with inherited definition 
NOTICE: merging column "info" with inherited definition 
NOTICE: merging column "crt_time" with inherited definition 
CREATE TABLE 
postgres=# create table p3 (like p including all) inherits(p); 
NOTICE: merging column "id" with inherited definition 
NOTICE: merging column "info" with inherited definition 
NOTICE: merging column "crt_time" with inherited definition 
CREATE TABLE 
往不同的分割槽寫入PK重複的資料

原文連結