Re: Query question

So far I have been unable to figure out how to do that.

I tried:
select a.equipment_id, b.log_date, b.log_time, b.event_desc
from (select distinct equipment_id from log_table) a
, (select equipment_id, log_date, log_time, event_desc from log_table order by log_date desc, log_time desc limit 5) b
where a.equipment_id = b.equipment_id

but all I end up with is 5 total records.

Stanton

From: "Martin Stöcker" <martin(dot)stoecker(at)stb-datenservice(dot)de>
To: "pgsql-sql" <pgsql-sql(at)lists(dot)postgresql(dot)org>
Sent: Thursday, March 8, 2018 1:07:30 PM
Subject: Re: Query question

My first idea is to select all equipments and lateral join them to the 5 most recent events

Regards Martin

Am 08.03.2018 um 19:58 schrieb Stanton Schmidt:

Hi,
I am new to the list so feel free to let me know if I am out of line.

My question is:
I have a table that has log events for pieces of equipment. For each piece of equipment this table may contain 1 or more (hundreds potentially).
I need to write a query that will return only the last 5 log events for each (and every) piece of equipment.

log_table (
equipment_id character(30),
log_date date,
log_time time,
event_desc text
)

Thanks for your help.

stanton schmidt
Database Administrator
direct. [ callto:920.884.1281 | 920. ] 471.4495 cell 920.660.1828

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