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;
end;
Haven't tried it, but it looks feasible.
HTH
David Lord
> -----Original Message-----
> From: Andrey Bronfin [mailto:[EMAIL PROTECTED]]
> 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.
>
>
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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Andrey Bronfin
> INET: [EMAIL PROTECTED]
>
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Lord, David - C&S
INET: [EMAIL PROTECTED]
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