diff --git a/src/Database/Manager.php b/src/Database/Manager.php
index 11b8dbc..b3a77e2 100644
--- a/src/Database/Manager.php
+++ b/src/Database/Manager.php
@@ -141,10 +141,20 @@ class Database_Manager
 		$this->db->query($q);
 	}
 
+    function getConstraintDef($c) {
+        if ($c['type'] == 'unique') {
+            return "UNIQUE(" . implode(", ", $c['fields']) . ")";
+        }
+        return "";
+    }
+
 	//CreateTableQuery('users',['id'=>['type'=>'integer','constraint'=>'PRIMARY KEY']])
 	public function CreateTableQuery($table, $fields, $constraints) {
 		$pg = $this->db->isPostgres();
 		if ($constraints) {
+            if (is_array($constraints)) {
+                $constraints = $this->getConstraintDef($constraints);
+            }
 			$constraints = ", " . $constraints;
         }