Perl does not complain because there is a hash value whose key is 'id' (it autovivifies when you mention it). DBI doesn't complain because undef (NULL) is a valid thing to send as a parameter to execute.

update : See discussion on autovivification below.

In reply to Re: Warnings not being thrown with DBI by jZed
in thread Warnings not being thrown with DBI by hubb0r

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