But you didn't use Data::Dumper, so we can't see what the hash reference contains. If you used it you might see something like:

$VAR1={ COLUMN=>'value', COLUMN2=>'value2' }
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So then you could see the names of the keys in your hash. As mentioned previously, you can't just do:

print "Foo %hash\n";
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and expect to get anything useful from it.

...roboticus

When your only tool is a hammer, all problems look like your thumb.