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* SQL - How to iterate with delay in a loop
@ 2026-03-06 12:07 Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>
0 siblings, 1 reply; 3+ messages in thread
From: Subramanian,Ramachandran @ 2026-03-06 12:07 UTC (permalink / raw)
To: pgsql-novice@lists.postgresql.org <pgsql-novice@lists.postgresql.org>
Hello,
I am trying to insert some rows into a table with a delay between each insert. I have a simple table with a ID column and some Date-Time columns.
The first two inserts work as expected and insert two rows, each one second apart.
However the do loop inserts 25 more rows, with the same timestamp.
I am completely new to Postgres and may have overlooked something simple.
I would be grateful for your help.
LG
Ram
drop table time_zone_demo;
create table time_zone_demo
(
ID_COLUMN SERIAL PRIMARY KEY,
SAVED_TS_NO_TZ TIMESTAMP,
SAVED_TS_WITH_TZ TIMESTAMPTZ,
SAVED_DATE DATE,
SAVED_TIME TIME
);
Insert into time_zone_demo (SAVED_TS_NO_TZ,SAVED_TS_WITH_TZ,SAVED_DATE,SAVED_TIME)
values (now(),now(),current_date,current_time) ;
select pg_sleep(1);
Insert into time_zone_demo (SAVED_TS_NO_TZ,SAVED_TS_WITH_TZ,SAVED_DATE,SAVED_TIME)
values (now(),now(),current_date,current_time) ;
select pg_sleep(1);
do $$
begin
for rec in 1..25
loop
perform pg_sleep(1);
Insert into time_zone_demo (SAVED_TS_NO_TZ,SAVED_TS_WITH_TZ,SAVED_DATE,SAVED_TIME)
values (now(),now(),current_date,current_time) ;
end loop;
end;
$$;
Freundliche Grüße
i. A. Ramachandran Subramanian
Zentralbereich Informationstechnologie
Alte Leipziger Lebensversicherung a.G.
Hallesche Krankenversicherung a.G.
Alte Leipziger Lebensversicherung a.G., Alte Leipziger-Platz 1, 61440 Oberursel
Vors. des Aufsichtsrats: Dr. Walter Botermann · Vorstand: Christoph Bohn (Vors.), Dr. Jürgen Bierbaum (stv. Vors.), Frank Kettnaker, Dr. Jochen Kriegmeier, Alexander Mayer, Christian Pape, Wiltrud Pekarek, Udo Wilcsek
Sitz Oberursel (Taunus) · Rechtsform VVaG · Amtsgericht Bad Homburg v. d. H. HRB 1583 · USt.-IdNr. DE 114106814
Hallesche Krankenversicherung a.G., Löffelstraße 34-38, 70597 Stuttgart
Vors. des Aufsichtsrats: Dr. Walter Botermann · Vorstand: Christoph Bohn (Vors.), Dr. Jürgen Bierbaum (stv. Vors.), Frank Kettnaker, Dr. Jochen Kriegmeier, Alexander Mayer, Christian Pape,
Wiltrud Pekarek, Udo Wilcsek
Sitz Stuttgart · Rechtsform VVaG · Amtsgericht Stuttgart HRB 2686 · USt.-IdNr. DE 147802285
Beiträge zu privaten Kranken- und Pflegekrankenversicherungen unterliegen nicht der Versicherungsteuer (§ 4 Nr. 5 VersStG) · Versicherungsleistungen sowie Umsätze aus Versicherungsvertreter-/Maklertätigkeiten sind umsatzsteuerfrei
Die Pflichtangaben der ALH Gruppe gemäß § 35a GmbHG bzw. § 80 AktG finden Sie hier: https://www.alte-leipziger.de/impressum
______________________
ALH Gruppe
Alte Leipziger-Platz 1, 61440 Oberursel
Tel.: +49 (6171) 66-4882
Fax: +49 (6171) 66-800-4882
E-Mail: ramachandran.subramanian@alte-leipziger.de
www.alte-leipziger.de
www.hallesche.de
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: SQL - How to iterate with delay in a loop
@ 2026-03-06 13:20 Laurenz Albe <laurenz.albe@cybertec.at>
parent: Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>
0 siblings, 1 reply; 3+ messages in thread
From: Laurenz Albe @ 2026-03-06 13:20 UTC (permalink / raw)
To: Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>; pgsql-novice@lists.postgresql.org <pgsql-novice@lists.postgresql.org>
On Fri, 2026-03-06 at 12:07 +0000, Subramanian,Ramachandran wrote:
> I am trying to insert some rows into a table with a delay between each insert.
> I have a simple table with a ID column and some Date-Time columns.
>
> The first two inserts work as expected and insert two rows, each one second apart.
>
> However the do loop inserts 25 more rows, with the same timestamp.
Use clock_timestamp()::time instead of current_time.
current_time returns the same value for each call in the same
database transaction. Think of it as "transaction start time".
Yours,
Laurenz Albe
^ permalink raw reply [nested|flat] 3+ messages in thread
* AW: SQL - How to iterate with delay in a loop
@ 2026-03-06 18:24 Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>
parent: Laurenz Albe <laurenz.albe@cybertec.at>
0 siblings, 0 replies; 3+ messages in thread
From: Subramanian,Ramachandran @ 2026-03-06 18:24 UTC (permalink / raw)
To: Laurenz Albe <laurenz.albe@cybertec.at>; pgsql-novice@lists.postgresql.org <pgsql-novice@lists.postgresql.org>
Thank you so much. That worked perfectly. 😊
LG
Ram
id_column | saved_ts_no_tz | saved_ts_with_tz | saved_date | saved_time
-----------+----------------------------+-------------------------------+------------+-----------------
20 | 2026-03-06 19:22:18.992382 | 2026-03-06 19:22:18.992384+01 | 2026-03-06 | 19:22:18.992385
21 | 2026-03-06 19:22:19.993481 | 2026-03-06 19:22:19.993484+01 | 2026-03-06 | 19:22:19.993485
22 | 2026-03-06 19:22:20.99458 | 2026-03-06 19:22:20.994583+01 | 2026-03-06 | 19:22:20.994584
23 | 2026-03-06 19:22:21.994803 | 2026-03-06 19:22:21.994806+01 | 2026-03-06 | 19:22:21.994806
24 | 2026-03-06 19:22:22.995918 | 2026-03-06 19:22:22.99592+01 | 2026-03-06 | 19:22:22.995921
25 | 2026-03-06 19:22:23.997049 | 2026-03-06 19:22:23.997051+01 | 2026-03-06 | 19:22:23.997052
26 | 2026-03-06 19:22:24.997807 | 2026-03-06 19:22:24.997809+01 | 2026-03-06 | 19:22:24.997809
27 | 2026-03-06 19:22:25.998923 | 2026-03-06 19:22:25.998926+01 | 2026-03-06 | 19:22:25.998927
Freundliche Grüße
i. A. Ramachandran Subramanian
Zentralbereich Informationstechnologie
Alte Leipziger Lebensversicherung a.G.
Hallesche Krankenversicherung a.G.
Alte Leipziger Lebensversicherung a.G., Alte Leipziger-Platz 1, 61440 Oberursel
Vors. des Aufsichtsrats: Dr. Walter Botermann · Vorstand: Christoph Bohn (Vors.), Dr. Jürgen Bierbaum (stv. Vors.), Frank Kettnaker, Dr. Jochen Kriegmeier, Alexander Mayer, Christian Pape, Wiltrud Pekarek, Udo Wilcsek
Sitz Oberursel (Taunus) · Rechtsform VVaG · Amtsgericht Bad Homburg v. d. H. HRB 1583 · USt.-IdNr. DE 114106814
Hallesche Krankenversicherung a.G., Löffelstraße 34-38, 70597 Stuttgart
Vors. des Aufsichtsrats: Dr. Walter Botermann · Vorstand: Christoph Bohn (Vors.), Dr. Jürgen Bierbaum (stv. Vors.), Frank Kettnaker, Dr. Jochen Kriegmeier, Alexander Mayer, Christian Pape,
Wiltrud Pekarek, Udo Wilcsek
Sitz Stuttgart · Rechtsform VVaG · Amtsgericht Stuttgart HRB 2686 · USt.-IdNr. DE 147802285
Beiträge zu privaten Kranken- und Pflegekrankenversicherungen unterliegen nicht der Versicherungsteuer (§ 4 Nr. 5 VersStG) · Versicherungsleistungen sowie Umsätze aus Versicherungsvertreter-/Maklertätigkeiten sind umsatzsteuerfrei
Die Pflichtangaben der ALH Gruppe gemäß § 35a GmbHG bzw. § 80 AktG finden Sie hier: https://www.alte-leipziger.de/impressum
______________________
ALH Gruppe
Alte Leipziger-Platz 1, 61440 Oberursel
Tel.: +49 (6171) 66-4882
Fax: +49 (6171) 66-800-4882
E-Mail: ramachandran.subramanian@alte-leipziger.de
www.alte-leipziger.de
www.hallesche.de
-----Ursprüngliche Nachricht-----
Von: Laurenz Albe <laurenz.albe@cybertec.at>
Gesendet: Freitag, 6. März 2026 14:21
An: Subramanian,Ramachandran IT-md-db <ramachandran.subramanian@alte-leipziger.de>; pgsql-novice@lists.postgresql.org
Betreff: Re: SQL - How to iterate with delay in a loop
On Fri, 2026-03-06 at 12:07 +0000, Subramanian,Ramachandran wrote:
> I am trying to insert some rows into a table with a delay between each insert.
> I have a simple table with a ID column and some Date-Time columns.
>
> The first two inserts work as expected and insert two rows, each one second apart.
>
> However the do loop inserts 25 more rows, with the same timestamp.
Use clock_timestamp()::time instead of current_time.
current_time returns the same value for each call in the same database transaction. Think of it as "transaction start time".
Yours,
Laurenz Albe
^ permalink raw reply [nested|flat] 3+ messages in thread
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2026-03-06 12:07 SQL - How to iterate with delay in a loop Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>
2026-03-06 13:20 ` Laurenz Albe <laurenz.albe@cybertec.at>
2026-03-06 18:24 ` AW: SQL - How to iterate with delay in a loop Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>
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