MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4
The foreign_keys table provides information
about foreign keys on NDB tables. This table
has the following columns:
object_id
The foreign key's object ID
name
Name of the foreign key
parent_table
The name of the foreign key's parent table
parent_columns
A comma-delimited list of parent columns
child_table
The name of the child table
child_columns
A comma-separated list of child columns
parent_index
Name of the parent index
child_index
Name of the child index
on_update_action
The ON UPDATE action specified for the
foreign key; one of No Action,
Restrict, Cascade,
Set Null, or Set
Default
on_delete_action
The ON DELETE action specified for the
foreign key; one of No Action,
Restrict, Cascade,
Set Null, or Set
Default