PostgreSQL 外键约束的一些问题 DEFERRABLE, NOT DEFERRABLE,INITIALLY IMMEDIATE 和 INITIALLY DEFERRED

PostgreSQL外键约束的一些问题deferred、not deferred、initially immediate和INITIALLY DEFERREDPostgreSQL外键约束Deferred、not deferred、INITIALLY IMMEDIATE和INITIALLY DEFERRED简介:http://www . PostgreSQL . org/docs/9.2/static/SQL-create table . html deferrable Not deferrable此Contra