Foreign key创建前提 Primay key 可以disable,但必须要有

SQL>

SQL> alter table A

2 drop constraint ABCD primary key (A)

3 disable

4 novalidate;

alter table A

drop constraint ABCD primary key (A)

disable

novalidate

ORA-01735: invalid ALTER TABLE option

SQL>

SQL> alter table A

2 drop constraint ABCD primary key (A)

3 disable

4 novalidate;

alter table A

drop constraint ABCD primary key (A)

disable

novalidate

ORA-01735: invalid ALTER TABLE option

SQL>

SQL> alter table A

2 drop constraint ABCD

3 ;

alter table A

drop constraint ABCD

ORA-02273: this unique/primary key is referenced by some foreign keys

SQL>

SQL> alter table B

2 drop constraint abc

3 ;

alter table B

add constraint abc

ORA-00931: missing identifier

SQL> alter table B drop constraint abc;

Table altered

SQL>

SQL> alter table B

2 add constraint abc foreign key (A)

3 references a (A)

4 disable

5 novalidate;

Table altered

SQL> alter table B drop constraint abc;

Table altered

SQL> alter table A drop constraint ABCD;

Table altered

SQL> alter table B add constraint abc foreign key (A) references a (A) disable novalidate;

alter table B add constraint abc foreign key (A) references a (A) disable novalidate

ORA-02270: no matching unique or primary key for this column-list

SQL>

SQL> alter table A

2 add constraint ABCD primary key (A)

3 disable

4 novalidate;

Table altered

SQL> alter table B add constraint abc foreign key (A) references a (A) disable novalidate;

Table altered

SQL>

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