- Some MariaDB packages bind MariaDB to 127.0.0.1 (the loopback IP address) by default as a security measure using the bind-address configuration directive. Old MySQL packages sometimes disabled TCP/IP networking altogether using the skip-networking directive.
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MySQL/MariaDB Table Foreign KeysA foreign key is a field in a relational table that matches the primary key column of another table. The foreign key can be used to cross-reference tables.
In the Foreign Keys tab, just simply click a foreign key field for editing. By using the foreign key toolbar, you can create new, edit and delete the selected foreign key field.
| Note: | Foreign Key support from MySQL 3.23.44 or later. Editing foreign key is supported from MySQL 4.0.13 or later. |
Description | |
| Add a foreign key to the table. Note: Both tables must be InnoDB type (or solidDB type if you have solidDB for MySQL). In the referencing table, there must be an index where the foreign key columns are listed as the first columns in the same order. Starting with MySQL 4.1.2, such an index will be created on the referencing table automatically if it does not exist. | |
Delete Foreign Key | Delete the selected foreign key. Note: Support from MySQL 4.0.13 or later. |
Use the Name edit box to enter a name for the new key.
Use the Referenced Database and Referenced Table drop-down lists to select a foreign database and table respectively.
To include field(s)/referenced field(s) to the key, just simply double-click the Fields/Referenced Fields field or click to open the editor(s) for editing.
The On Delete and On Update drop-down list define the type of the actions to be taken.
| CASCADE | Delete the corresponding foreign key, or update the corresponding foreign key to the new value of the primary key. |
| SET NULL | Set all the columns of the corresponding foreign key to NULL. |
| No ACTION | Does not change the foreign key. |
| RESTRICT | Produce an error indicating that the deletion or update would create a foreign key constraint violation. |
Related topic:
Foreign Keys Data Selection
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