Re: FW: An SQL question , not easy ;-)

1. Create table CC with 2 fields: DT DATE, CALL_COUNT NUMBER .
2. Fill table CC with tuples with DT started from MIN(CALL_START) up to MAX(CALL_END) and CALL_COUNT = 0. Step of DT value is 1 minute (or second = 36mil tuples/year).
3. for every tuple in a table of phone calls update table CC and set CALL_COUNT = CALL_COUNT + 1 WHERE DATE >= CALL_START AND DATE <= CALL_END .
4. select max(call_count) from CC.

It's very lazy :-))), but you will get right number.

 Jan Pruner

Dne st 15. srpen 2001 12:40 jste napsal(a):
> 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.
>

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Author: Jan Pruner
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