SUM all timeelapse WHERE timetype = 'Break' but only the rows that are after(below) timetype = 'Start'

))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-after-below-timetype-Start-tp5855509.html
Sent from the PostgreSQL - admin mailing list archive at Nabble.com.