(any other comment or criticism on the code is warmly welcome)
I'll point out a SQL bug in your code:
my $sql = << "__SQL__";
declare \@AZIONE int;
set \@AZIONE = (SELECT id FROM desAz WHERE az LIKE 'XXXX%' );
select * from desCc where id = \@AZIONE;
It is possible that SELECT id FROM desAz WHERE az like '...'
could return more than one row, @AZIONE
will get set to the last value returned. That's one of the reasons why using a JOIN here would be a lot better.
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