ORA-02291: violating full constraints (*)-parent keywords not found

This often happens in Oracle, where ORA-02291: violates the full constraints (*)-parent keywords not found

The following describes the possible causes:

Scenario:

A field in Table A is A foreign key associated with A field in Table B. This situation occurs when data is inserted into Table.

Possible causes:

1. When inserting data into Table A, the field associated with the foreign key must have data in Table B. This is the case if Table B does not have data.

2. A foreign key ring is generated, that is, the field associated with the foreign key in Table B is associated with the field in table C, but the corresponding field in Table C does not have data.

3. If it is not the above two cases, it is A very easy to neglect problem: the data type and length of the foreign key field in A and the field associated with the foreign key in B are inconsistent. In particular, the data length must be consistent.

The third case is the easiest to ignore. I hope you will pay attention to it.