Drop sequence and cascade

Question

I would like to drop the sequence used in table and the table itself in one statement using CASCADE, but I\'m getting NOTICE and table is not dropped. For example:

Answer 1

You have a misconception about dependencies. The table never is a depending object of an associated sequence and is never dropped by a

DROP SEQUENCE ... CASCADE;

Only a DEFAULT value drawing from the sequence "depends" on the sequence and is set to NULL if the sequence is deleted with CASCADE.

It is the other way round: if the sequence is owned by a table column it is dropped with a

DROP TABLE f1 CASCADE;

For a sequence to be owned by a table column you can either use the serial type as Milen already suggested. Or you can ALTER an existing sequence:

ALTER SEQUENCE seq1 OWNED BY t1.f1;