Re: Sequences

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Hi Lance,

Please look into this and go through the below link..

http://www.postgresqltutorial.com/postgresql-serial/

Hope this help..




On Wed, Dec 5, 2018 at 11:42 AM Rui DeSousa <rui@xxxxxxxxxxxxx> wrote:

Why not just do this:

select schemaname
  , sequencename
  , last_value
  , increment_by
from pg_sequences
;


> On Dec 4, 2018, at 2:47 PM, Campbell, Lance <lance@xxxxxxxxxxxx> wrote:
>
> Thanks so much.  This was very helpful!  Thanks.
>
> Lance
>
> On 12/4/18, 1:18 PM, "Alex Balashov" <abalashov@xxxxxxxxxxxxxxx> wrote:
>
>    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/
>
>
>



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