Experimental query. [skip ci]

app/Repositories/Account/AccountRepository.php

@@ -13,6 +13,7 @@ use FireflyIII\Models\TransactionJournal;
 use FireflyIII\Models\TransactionType;
 use FireflyIII\User;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Query\Builder;
 use Illuminate\Database\Query\JoinClause;
 use Illuminate\Support\Collection;
 use Log;
@@ -323,8 +324,25 @@ class AccountRepository implements AccountRepositoryInterface
         }
         if ($accounts->count() > 0) {
             $accountIds = $accounts->pluck('id')->toArray();
-            $query->leftJoin('transactions as t', 't.transaction_journal_id', '=', 'transaction_journals.id');
+            $query->leftJoin(
-            $query->whereIn('t.account_id', $accountIds);
+                'transactions as source', function (JoinClause $join) {
+                $join->on('source.transaction_journal_id', '=', 'transaction_journals.id')->where('amount', '<', 0);
+            }
+            );
+            $query->leftJoin(
+                'transactions as destination', function (JoinClause $join) {
+                $join->on('destination.transaction_journal_id', '=', 'transaction_journals.id')->where('amount', '>', 0);
+            }
+            );
+
+            // XOR. must be either.
+            $query->where(
+                function (Builder $query) use ($accountIds) {
+                    $query->whereIn('source.account_id', $accountIds, 'xor')
+                          ->whereIn('destination.account_id', $accountIds, 'xor');
+                }
+            );
+
         }
         // that should do it:
         $complete = $query->get(TransactionJournal::queryFields());