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It is also possible to disable all foreign key constraints in PostgreSQL using the DISABLE TRIGGER command. This is useful if you need to perform a bulk update or delete operation that would otherwise violate a foreign key constraint.

Here is an example of how to disable a foreign key constraint in PostgreSQL:

ALTER TABLE orders DISABLE TRIGGER ALL;
To re-enable the foreign key constraint, you can use the ENABLE TRIGGER command:

ALTER TABLE orders ENABLE TRIGGER ALL;