Judging by its name, I would guess that selectall_arrayref returns a reference to an array. If that is what the documentation says, then you should be able to dereference the array to get a count of its elements: 
print "Number of rows selected: ", scalar @{$all};

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See also: References quick reference

In reply to Re: Counting rows Sqlite by toolic
in thread Counting rows Sqlite by fanticla

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