Fellow Monks, I come to you with limited sql power and mediocre perl knowledge asking you for your help in finishing this question. I am attempting to get a count of users in a database that fall into one of three categories. It is a decibel recording DB that keeps track at the levels at which modems are speaking on a RF network, in dB of course. The 3 groups are less then 30, 30-40, and 40 plus dB.
The current way I am doing it is with a mixture of the following sql: 

my $sql = "select power_level, decode(power_level,null,'NA',decode(sig
+n(power_level-30),-1,'1',
                        decode(sign(power_level-40),1,'2','3')))
                 from wbr_power
                 where host_name in (
                       select host_name
                       from hosts
                       where market_id = '$market'
                       )";

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And the following perl doing simple iterations on the array returned : 
my ($lessThan, $inBetween, $greaterThan) = 0;
       foreach my $code (@powerCodes) {
         if ($code->[1] eq '1'){
           $lessThan++;
         }elsif ($code->[1] eq '2'){
           $inBetween++;
         }elsif ($code->[1] eq '3'){
           $greaterThan++;
         }
       }

[download]
There must be someway through joins and count() or sum() to do this all on the oracle end. But like I said, still pretty wet in the SQL relm. Please help.


Tradez
"Never underestimate the predicability of stupidity"
- Bullet Tooth Tony, Snatch (2001)

In reply to Whether to perl or oracle by tradez

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