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# When it is not typed, the arguments will start as "" blank
# (which means all ids)
...
    @id =  @{$dbh->selectall_arrayref($sql,undef,'no')};
    print join (", ", @id), "\n";
}

Running SELECT id FROM mytable     WHERE id=? AND salary >= 1 for ARRA
+Y(0x1011e70)
ID: ARRAY(0x1011e70), 1 lines dumped to csvfile1_ARRAY(0x1011e70).csv

Argument "" isn't numeric in subroutine entry at ./test.pl line 108.