Oh, I missed that bit about returning at most one row! He can simply use 

my $row = $dbh->selectrow_arrayref($stmt_or_sth);

[download]

or 

my $row = $sth->fetch_arrayref();
$sth->finish();

[download]

defined($row) will tell him if a row was returned. If the row only contains one field and it can't be NULL, then he could even use 

my ($value) = $sth->fetch_array();
$sth->finish();

[download]

defined($value) will tell him if a value was returned (again, assuming the value can't be NULL).

In reply to Re^3: Counting number of rows while working with Oracle by ikegami
in thread Counting number of rows while working with Oracle by denzil_cactus

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