Hi Monks, Not sure how to approach the following issue. I am retrieving values from a DB using fetchrow. I am pushing the values that are being returned into an array. I will then use the values from this array to issue another query to a different DB. The code looks something like this:

my $queryID = "select id, name from studentTable";
my $sth_queryID = $dbh->prepare($queryID);
$sth_queryID->execute();

my @studentInfo;
while (my @row = $sth_queryID->fetchrow){
   push @studentInfo, @row;
}

$sth_queryID->finish;

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@studentInfo will look something like this: @studentInfo = ("001","John","002","Mary","003","Tom") Now, I want to use each id (each of the odd indices within @studentInfo) to issue another query. I will also need to use the corresponding name of that id to insert as a row of a HTML table. So, the code might resemble the following:

foreach (@studentInfo_with_an_odd_index){
    my $studentID = $_;
    my $queryGrade = "select id from grades where 
    id = '$studentID' and grade = 'A'";
    $my sth_queryGrade->prepare($queryGrade);
    $sth_queryGrade->execute();

    while (my @g = $sth_queryGrade->fetchrow){
        print "<TR>";
        print "<TD>$g[0]</TD>";
        print "<TD>$student_name_for_this_id</TD>";
        print "</TR>";
    }
}

$sth_queryGrade->finish;
$dbh->disconnect;

[download]
Any ideas on how I can find @studentInfo_with_an_odd_index and $student_name_for_this_id from the above code? Thanks in advance for your help monks.

In reply to Find odd/even elements of array by perlPractioner

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