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From: Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>
To: pgsql-novice@lists.postgresql.org <pgsql-novice@lists.postgresql.org>
Subject: SQL - How to iterate with delay in a loop
Date: Fri, 6 Mar 2026 12:07:05 +0000
Message-ID: <6c2c6ae6d61a467a91d08414e38b50c5@alte-leipziger.de> (raw)

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.





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