#!/usr/bin/env perl
use strict;
use warnings;
use feature 'say';
use Data::Printer;
# populating your hash
my %data = map { chomp; $_ => 1 } <DATA>;
# for your example, might look something like this:
# my %data = map { $_ => 1 } $sth->fetchrow(); # do you mean fetchrow_
+array?
# two ways to check whether key exists in hash
say "ABC exists" if exists $data{'ABC'};
say "JKL exists" if $data{'JKL'} == 1;
p %data;
__DATA__
ABC
JKL
HGJ
KJI
GHJ
LKJ
Output:
{
ABC 1,
GHJ 1,
HGJ 1,
JKL 1,
KJI 1,
LKJ 1
}
ABC exists
JKL exists
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