| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> RE: An SQL question , not easy ;-)
David,
Here's the output from your suggestion based on a table with the following rows;
CALL_START CALL_END
----------------- ----------------- 01-AUG-2001 12:10 01-AUG-2001 12:40 01-AUG-2001 12:15 01-AUG-2001 12:30
01-AUG-2001 12:10 - 1 01-AUG-2001 12:15 - 2 01-AUG-2001 12:25 - 3 01-AUG-2001 12:30 - 2 01-AUG-2001 12:40 - 1 01-AUG-2001 12:45 - 2 01-AUG-2001 12:47 - 1 01-AUG-2001 12:55 - 0
-----Original Message-----
Sent: 15 August 2001 14:11
To: Multiple recipients of list ORACLE-L
How about: -
declare
l_count pls_integer := 0;
begin
for rec in (
select call_start time, 1 incr from table
union all
select call_end time, -1 incr from table
order by 1
) loop
l_count := l_count + rec.incr;
dbms_output.put_line( to_char(rec.time) || ' - ' || l_count
)
end loop;
Haven't tried it, but it looks feasible.
HTH
David Lord
> -----Original Message-----
> From: Andrey Bronfin [mailto:andreyb_at_elrontelesoft.com]
> Sent: 15 August 2001 11:21
> To: Multiple recipients of list ORACLE-L
> Subject: An SQL question , not easy ;-)
>
>
> Dear gurus !
> I have a table of phone calls , 2 fields : CALL_START DATE
> , CALL_END
> DATE .
> I need an SQL statement or a PL/SQL block to calculate the
> maximum number of
> SIMULTANIOUS phone conversations.
> Please help !!!
> Thanks a lot in advance !
> Andrey.
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Andrey Bronfin
> INET: andreyb_at_elrontelesoft.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
>
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Lord, David - C&S INET: David.Lord_at_hayscsg.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Thomas, Kevin INET: Kevin.Thomas_at_calanais.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Wed Aug 15 2001 - 08:11:03 CDT
 |
 |