On 06/24/2015 09:11 PM, litu16 wrote:
This is my table...
<http://postgresql.nabble.com/file/n5855074/screenshot.jpg>
I would like to get the time difference between 'time_type = Lap' AND
'time_type = Start' in order to fill 'time_elapse'. Im almost sure that this
code works...
* CREATE OR REPLACE FUNCTION timediff()
RETURNS trigger AS
$BODY$
DECLARE
t_ix real;
BEGIN
IF NEW.time_type = 'Lap' THEN
SELECT t.time FROM table_ebscb_spa_log04 t WHERE t.fn_name =
NEW.fn_name AND t.time_type = 'Start' ORDER BY t.stmtserial DESC LIMIT 1
INTO t_ix;
IF NOT FOUND THEN
RAISE EXCEPTION USING MESSAGE = 'There is not any previous
row...';
ELSE
NEW.time_elapse := t_ix - NEW.time;
END IF;
END IF;
return NEW;
END
$BODY$
LANGUAGE plpgsql VOLATILE*
But I don't know how to get the time difference between the two timestamps
cells in a special format: (years/months/days
hours:minutes:seconds:miliseconds) like this...
Well subtracting two timestamps gets you an interval:
http://www.postgresql.org/docs/9.4/interactive/functions-datetime.html
Table 9-27. Date/Time Operators
which you can convert:
http://www.postgresql.org/docs/9.4/interactive/functions-formatting.html
to_char(interval, text) text convert interval to string
to_char(interval '15h 2m 12s', 'HH24:MI:SS')
so:
postgres@production=# SELECT to_char(interval '15h 2m 12s', 'HH24:MI:SS');
to_char
----------
15:02:12
(1 row)
* 0y/0m/0d 00:00:01.001*
Is this possible??
Thanks Advanced.
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Adrian Klaver
adrian.kla...@aklaver.com
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