pg.ddx.io pgsql-admin@postgresql.org mailing list archive
help / color / mirror / Atom feedSUM all timeelapse WHERE timetype = 'Break' but only the rows that are after(below) timetype = 'Start'
2+ messages / 2 participants
[nested] [flat]
* SUM all timeelapse WHERE timetype = 'Break' but only the rows that are after(below) timetype = 'Start'
@ 2015-06-28 05:56 litu16 <litumelendez@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: litu16 @ 2015-06-28 05:56 UTC (permalink / raw)
To: pgsql-admin
))Hi all, This is my table...
<http://postgresql.nabble.com/file/n5855509/screenshot.jpg;
This is the SQL statement to create the same table...
* CREATE TABLE tbl_ebscbspa_log05
(
pcnum smallint NOT NULL,
fnserial serial NOT NULL,
fnname character varying NOT NULL,
timestmp timestamp without time zone DEFAULT clock_timestamp(),
timeelapse interval,
timetype character varying,
timeindex real,
CONSTRAINT table_ebscb_spa_log05_pkey PRIMARY KEY (fnserial)
)
WITH (
OIDS=FALSE
);
ALTER TABLE tbl_ebscbspa_log05
OWNER TO postgres;*
How can I SUM all timeelapse WHERE timetype = 'Break' AND that are placed
after(below) the last(descendent) timetype = 'Start'? So in the table above
Ill get both blue square colored rows summed up. So I get 'totalbreak' =
00-00-00 02:00:00.000
How would be the syntax to select all possible 'Breaks' after the
last(descendent) 'Start' and sum them up? (lets say the max possible
'Breaks' are nine).
I have try this, resulting NULL
*SELECT t.timeelapse FROM tbl_ebscbspa_log05 t WHERE t.timetype =
'Break' AND NOT EXISTS (SELECT 1 FROM tbl_ebscbspa_log05 WHERE timetype =
'Start' AND 'timestmp' > 't.timestmp') INTO v_timeelapse_break;
IF FOUND THEN
NEW.timeelapse := v_timeelapse_break;*
Pls I would like to know how to SUM THEM UP, not just SELECT THEM, hope some
good PostgreSQL fellow programmer could give me a hand with it.
Thanks Advanced.
--
View this message in context: http://postgresql.nabble.com/SUM-all-timeelapse-WHERE-timetype-Break-but-only-the-rows-that-are-afte...
Sent from the PostgreSQL - admin mailing list archive at Nabble.com.
--
Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-admin
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: SUM all timeelapse WHERE timetype = 'Break' but only the rows that are after(below) timetype = 'Start'
@ 2015-06-30 20:17 David G. Johnston <david.g.johnston@gmail.com>
parent: litu16 <litumelendez@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: David G. Johnston @ 2015-06-30 20:17 UTC (permalink / raw)
To: litu16 <litumelendez@gmail.com>; +Cc: pgsql-admin
On Sun, Jun 28, 2015 at 1:56 AM, litu16 <litumelendez@gmail.com> wrote:
>
> Pls I would like to know how to SUM THEM UP, not just SELECT THEM, hope
> some
> good PostgreSQL fellow programmer could give me a hand with it.
>
>
http://www.postgresql.org/docs/9.4/interactive/functions-aggregate.html
Also see "GROUP BY"
Instead of showing a picture of a table you might get more help if you make
into into a VALUES-based CTE and incorporate it directly into an example
query.
WITH data AS ( VALUES (...),(...),(...) )
SELECT ...
FROM data
...
David J.
^ permalink raw reply [nested|flat] 2+ messages in thread
end of thread, other threads:[~2015-06-30 20:17 UTC | newest]
Thread overview: 2+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2015-06-28 05:56 SUM all timeelapse WHERE timetype = 'Break' but only the rows that are after(below) timetype = 'Start' litu16 <litumelendez@gmail.com>
2015-06-30 20:17 ` David G. Johnston <david.g.johnston@gmail.com>
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox