在什么情况下会发生错误23001（restrict_violation）？

Question

从名字的角度来看，我以为“ ON DELETE RESTRICT”会触发它，但是会触发错误23503（违反FK）：

 create table a (id serial primary key);
 insert into a default values;
 create table b (id serial primary key, a_id integer references a (id) not null);
 insert into b (a_id) values (1);
 delete from a where id=1;


ERROR:  23503: update or delete on table "a" violates foreign key constraint "b_a_id_fkey" on table "b"
DETAIL:  Key (id)=(1) is still referenced from table "b".
SCHEMA NAME:  public
TABLE NAME:  b
CONSTRAINT NAME:  b_a_id_fkey
LOCATION:  ri_ReportViolation, ri_triggers.c:2797

Answer 1

在IRC上进行了询问并检查了代码，它看起来很像23001，尽管它可能是由存储的proc等生成的，但在标准的postgresql中目前没有出现。