Slight correction. 2024-06-03 07:55 に Tomohiro Hosaka さんは書きました:
Here $rc is dualvar. https://metacpan.org/pod/DBI#execute
This is not dualvar, exactly. However, the patch is unchanged.Evaluated as a bool, it is "0E0" true; evaluated as a number, it is the number of cases.
You may use $cnt for more simplicity.