Re: execute same query only one time?

Not an expert, but I would try a temporary unlogged table.

Sent from my android device.

-----Original Message-----
From: Johannes <jotpe(at)posteo(dot)de>
To: pgsql-general(at)postgresql(dot)org
Sent: Mon, 08 Feb 2016 11:07
Subject: [GENERAL] execute same query only one time?

Hi,

is there a best practice to share data between two select statements?

Imaging following situation: I want to receive two result sets from two
tables, referring to a specific id from table t0 AND I try not to query
for that specific id a second time.

Table t0 returns 1 row and table t1 returns multiple rows.

begin;
select id, col1, col2, ... from t0 where id = (select max(id) from t0
where col1 = value1 and col2 = value2 and ...);
select col1 from t1 where t0_id = (select max(id) from t0 where col1 =
value1 and col2 = value2 and ...);
commit;

Best regards Johannes