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Setting reference options
Set rule ON DELETE from the respective drop-down list.
| • | RESTRICT Produce an error indicating that the deletion or update would create a foreign key constraint violation. |
| • | CASCADE Delete any rows referencing the deleted row, or update the value of the referencing column to the new value of the referenced column, respectively. |
| • | SET NULL Set the referencing column(s) to null. |
| • | SET DEFAULT Set the referencing column(s) to their default values. |
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