Information Schema INNODB_SYS_FOREIGN Table
The Information Schema INNODB_SYS_FOREIGN table contains information about InnoDB foreign keys.
The PROCESS privilege is required to view the table.
It has the following columns:
| Column | Description |
|---|---|
ID | Database name and foreign key name. |
FOR_NAME | Database and table name of the foreign key child. |
REF_NAME | Database and table name of the foreign key parent. |
N_COLS | Number of foreign key index columns. |
TYPE | Bit flag providing information about the foreign key. |
The TYPE column provides a bit flag with information about the foreign key. This information is OR'ed together to read:
| Bit Flag | Description |
|---|---|
1 | ON DELETE CASCADE |
2 | ON UPDATE SET NULL |
4 | ON UPDATE CASCADE |
8 | ON UPDATE SET NULL |
16 | ON DELETE NO ACTION |
32 | ON UPDATE NO ACTION |
Example
SELECT * FROM INNODB_SYS_FOREIGN\G
*************************** 1. row ***************************
ID: mysql/innodb_index_stats_ibfk_1
FOR_NAME: mysql/innodb_index_stats
REF_NAME: mysql/innodb_table_stats
N_COLS: 2
TYPE: 0
...
Comments
Comments loading...
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.
