Date: Tue, 4 Dec 2018 14:17:51 -0500
From: Alex Balashov <abalashov@evaristesys.com>
To: pgsql-admin@lists.postgresql.org
Subject: Re: Sequences
Message-ID: <20181204191751.GL769@tlaquepaque.localdomain>
References: <87E05184-8087-4225-BBCC-F60B74F18023@illinois.edu>
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Organization: Evariste Systems 
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Constructing dynamic SQL is always a bit tricky. Try define this
function:

---
CREATE OR REPLACE FUNCTION seqs_last_val()
RETURNS SETOF record
AS $$
  DECLARE
    _seqname varchar;
    _r record;
  BEGIN
    SELECT INTO _r null::varchar AS seqname, -1::integer AS lastval;

    FOR _seqname IN
      SELECT sequence_name
      FROM information_schema.sequences
      WHERE sequence_schema = 'public'
    LOOP
      _r.seqname = _seqname;
      EXECUTE format('SELECT last_value FROM %s', quote_ident(_seqname)) INTO _r.lastval;
      RETURN NEXT _r;
    END LOOP;

    RETURN;
  END
$$ LANGUAGE 'plpgsql';
---

Then run:

   SELECT * FROM seqs_last_val() AS (seqname varchar, last_value integer);

-- Alex

On Tue, Dec 04, 2018 at 07:03:11PM +0000, Campbell, Lance wrote:
> PostgreSQL 10.x
> 
> What query will give the name of all sequences in a database and the current or next value for each sequence?
> 
> This will give me everything except for the next value in the sequence.
> 
> SELECT * FROM information_schema.sequences;
> 
> Thanks,
> 
> Lance

-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/