diff --git a/src/SelectQuery.php b/src/SelectQuery.php
index 436e657..5263807 100644
--- a/src/SelectQuery.php
+++ b/src/SelectQuery.php
@@ -12,6 +12,7 @@ class SelectQuery {
   public $objectType;
   public $limit;
   public $conditions = [];
+  public $operator = 'AND';
 
   /**
    * Constructor which sets the query object type.
@@ -73,7 +74,7 @@ class SelectQuery {
       foreach ($this->conditions as $condition) {
         $where[] = implode('+', $condition);
       }
-      $query .= '+WHERE+' . implode('+AND+', $where);
+      $query .= '+WHERE+' . implode('+' . $this->operator . '+', $where);
     }
 
     if ($this->order) {