我在这样的声明中找到了它：
delete /*+ restrict_all_ref_cons */ from table_1 where ...
任何人都可以提供一些关于提示正在做什么的信息吗？
该数据库是 Oracle 数据库 10.2.0.3.0。
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1 回答
4
该提示禁用级联删除，因此从父表中删除时不会从子表中删除子行。
请参见此处的示例；
create table s11 ( x int primary key );
create table s12 ( y int primary key, x references s11 on delete cascade );
insert into s11 values (1);
insert into s12 values (1, 1);
commit;
SQL> delete from s11;
1 row deleted.
SQL> select * from s12;
no rows selected <=========== when deleting parent row in s11, the child row in s12 is also deleted.
SQL> rollback;
Rollback complete.
SQL> delete /*+ RESTRICT_ALL_REF_CONS */ from s11;
1 row deleted.
SQL> select * from s12; <=========== with RESTRICT_ALL_REF_CONS hint, the child row will not be deleted.
Y X
---------- ----------
1 1
于 2012-06-12T13:48:59.360 回答