diff --git a/process/Sql_lib/process.js b/process/Sql_lib/process.js
index 3c3b7d4340db0adf8bbb5bf0965c3da38c57b13e..d7e0dfffe06d84833ecfb8d6702f90aab1dc1d9b 100644
--- a/process/Sql_lib/process.js
+++ b/process/Sql_lib/process.js
@@ -1334,6 +1334,11 @@ SqlBuilder.EXISTS = function()
     return "exists ?";
 }
 
+SqlBuilder.NOT_EXISTS = function()
+{
+    return "exists ?";
+}
+
 //TODO: more detailed comments with examples
 
 /**