in reply to Re^2: Perl DBI fetchall_arrayref - puzzling behaviour
in thread Perl DBI fetchall_arrayref - puzzling behaviour

I think it would be easier to quote the documentation: 

UNION

Specifies that multiple result sets are to be combined and returned as
+ a single result set.

ALL

Incorporates all rows into the results, including duplicates. If not s
+pecified, duplicate rows are removed.

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