Hmmm... Sorry for not including the whole code...here it is. I moved the prepare statement outside the loop. The reason the tables are not joined - the fields I am using are uniquely named - so I do not need to reference them (ie a.field1=b.field2) - do I? Here is the whole code (my apologies for my poor style):

#!/usr/bin/perl -w                                                    
+      
### you know you can probably do this with temp tables in SQL....VVP  
+      
### Description:  change old ccodes with new ones provided            
+      
### Will affect rtsdetail table - ccode field                         
+      
                                                                      
+      
use DBI;            # Load the DBI module                             
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use CGI;        # HTML                                                
+      
use strict;     # keep it usable                                      
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use CGI qw(:standard);                                                
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use CGI::Carp qw( fatalsToBrowser );                                  
+      
                                                                      
+      
                                                                      
+      
###                                                                   
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my ($sth);                                                            
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my $ccode;                                                            
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my(@data,$data);                                                      
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my ($p_str,@p_str);                                                   
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my $i=0;  # counter                                                   
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my ($CC,@CC);                                                         
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my ($po,@po);                                                         
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my ($old,$new);                                                       
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my (@old,@new);                                                       
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my $count;                                                            
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my $total;                                                            
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my $head_date;                                                        
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open (CC,"ccchg.txt");                                                
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        while ($_=<CC>) {                                             
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        push (@CC,$_);                                                
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        ($old,$new)=split(/\|/,$_);                                   
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        push @old,$old;                                               
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        push @new,$new;                                               
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        }                                                             
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close (POCOL);                                                        
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+      
                                                                      
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$i=@new;                                                              
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#print "$i - EYE \n";                                                 
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### Attributes to pass to DBI->connect() to disable automatic         
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### error checking                                                    
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my %attr = (                                                          
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    PrintError => 0,                                                  
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    RaiseError => 0,                                                  
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);                                                                    
+      
                                                                      
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### Perform the connection using the Informix driver                  
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my $dbh = DBI->connect( "dbi:Informix:nps\@sumitt_aaa","netsite","Ppol
+0699" 
 ,\%attr )or die "Can't connect to database: ", $DBI::errstr, "\n";   
+      
                                                                      
+      
$sth=$dbh->prepare("select det_number,det_ccode,head_date from podetai
+l a,po
er b where det_number=head_number and head_date>'2002/01/01'");       
+      
                                                                      
+      
$sth->execute();                                                      
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# will dump out all fields $data=$sth->dump_results();                
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#$data=$sth->dump_results();                                          
+      
                                                                      
+      
                while ( ($po, $ccode,$head_date)  = $sth->fetchrow_arr
+ay() )
                #print " $po $ccode, $head_date \n";                  
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                push (@po,$po);                                       
+      
                                                                      
+      
        }                                                             
+      
$sth->finish;                                                         
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$p_str=@po;                                                           
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print "# of POs: $p_str \n";                                          
+      
        $sth=$dbh->prepare("select a.det_number from podetail a, pohea
+der b 
e det_ccode=? and head_date>'2002/01/01' and a.det_number=?");        
+      
foreach $po(@po) {                                                    
+      
        for ($count=0; $count<=$i;$count++) {                         
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        #print "old cc: $old[$count], PO checked: $po \n";            
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        $sth->execute($old[$count],$po);                              
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        $p_str=$sth->fetchrow_array();                                
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                if ($p_str) {                                         
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                push (@p_str,$p_str);                                 
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                print "$p_str \n";                                    
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                }                                                     
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$sth->finish;                                                         
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        }                                                             
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}                                                                     
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$total=@p_str;                                                        
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print "Total: $total  AND @p_str \n";                                 
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$total=@po;                                                           
+      
print "POs used: $total \n";
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Thanks, V He who laughs last, doesn't get the joke.