"David G. Johnston" <david.g.johns...@gmail.com> writes: > On Saturday, June 10, 2023, Umut TEKİN <umuttec...@gmail.com> wrote: >> it does not create any pg_depend entry for this sequence and table pair. So, >> it is not possible to track down to find the pairs. Is there any other way >> to find the sequence and the table pairs created using method 2?
> You can alter a manually created sequence to be owned by a table and thus > get the dependency added even in the second case. Yeah, that would be the way to match what SERIAL does (see [1]). In the quoted example, there is a dependency from the column's default expression to the sequence, so you could still detect the connection without the ownership dependency; it's just harder. You have regression=# select pg_describe_object(classid,objid,objsubid) as obj, pg_describe_object(refclassid,refobjid,refobjsubid) as ref, deptype from pg_depend where objid >= 'public.actor_actor_id_seq'::regclass order by objid, refobjid; obj | ref | deptype -----------------------------------------------------+---------------------------------------------------------+--------- sequence actor_actor_id_seq | schema public | n table actor | schema public | n type actor[] | type actor | i type actor | table actor | i default value for column actor_id of table actor | sequence actor_actor_id_seq | n default value for column actor_id of table actor | column actor_id of table actor | a default value for column last_update of table actor | column last_update of table actor | a toast table pg_toast.pg_toast_89174 | table actor | i index pg_toast.pg_toast_89174_index | column chunk_id of toast table pg_toast.pg_toast_89174 | a index pg_toast.pg_toast_89174_index | column chunk_seq of toast table pg_toast.pg_toast_89174 | a (10 rows) versus obj | ref | deptype ---------------------------------------------+---------------------------------------------------------+--------- sequence fruits_id_seq | schema public | n sequence fruits_id_seq | column id of table fruits | a table fruits | schema public | n type fruits[] | type fruits | i type fruits | table fruits | i default value for column id of table fruits | sequence fruits_id_seq | n default value for column id of table fruits | column id of table fruits | a toast table pg_toast.pg_toast_89182 | table fruits | i index pg_toast.pg_toast_89182_index | column chunk_seq of toast table pg_toast.pg_toast_89182 | a index pg_toast.pg_toast_89182_index | column chunk_id of toast table pg_toast.pg_toast_89182 | a index fruits_pkey | constraint fruits_pkey on table fruits | i constraint fruits_pkey on table fruits | column id of table fruits | a (12 rows) regards, tom lane [1] https://www.postgresql.org/docs/current/datatype-numeric.html#DATATYPE-SERIAL