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my @fields = keys(%hash);
my @params = @hash{@fields};
my $query = "SELECT row_id FROM Table WHERE " . 
             join(" AND ", map {"$_ = ?"} @fields);

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my @fields = keys(%hash);
my $query = "SELECT row_id FROM Table WHERE " . 
             join(" AND ",
                  map {"$_ = " . $dbh->quote($hash{$_})} @fields);