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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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