CODEWITHSUNDEEP
postgresql
liu246437
liu246437

Reputation: 329

How to get list of sequence names in Postgres?

I want to get the list of sequence names in Postgres.

In Oracle, I can use:

select sequence_name 
from user_sequences

But in Postgres when I use that statement it always throws the error: not found user_sequences.

How can I do this in Postgres?

Upvotes: 20

Views: 36088

Answers (2)

user330315
user330315

Reputation:

You can use:

select sequence_schema, sequence_name
from information_schema.sequences;

That will return a list of sequences accessible to the current user, not the ones owned by him.

If you want to list sequences owned by the current user you need to join pg_class, pg_namespace and pg_user:

select n.nspname as sequence_schema, 
       c.relname as sequence_name,
       u.usename as owner
from pg_class c 
  join pg_namespace n on n.oid = c.relnamespace
  join pg_user u on u.usesysid = c.relowner
where c.relkind = 'S'
  and u.usename = current_user;

In Postgres a user can own objects (e.g. sequences) in multiple schemas, not just "his own", so you also need to check in which schema the sequence is created.

More details in the manual:

Upvotes: 37

DunnoHowToCode
DunnoHowToCode

Reputation: 541

SELECT c.relname FROM pg_class c WHERE c.relkind = 'S';
Or trying running psql as psql -U username -E followed by \ds. This will show you the query that was been used to generate the result as well.

Upvotes: 18

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