diff --git a/orm_lib/inc/drogon/orm/Criteria.h b/orm_lib/inc/drogon/orm/Criteria.h
index 5b1aa398..2b761df3 100644
--- a/orm_lib/inc/drogon/orm/Criteria.h
+++ b/orm_lib/inc/drogon/orm/Criteria.h
@@ -40,6 +40,7 @@ enum class CompareOperator
     LE,
     Like,
     In,
+    NotIn,
     IsNull,
     IsNotNull
 };
@@ -107,8 +108,6 @@ class DROGON_EXPORT Criteria
             case CompareOperator::Like:
                 conditionString_ += " like $?";
                 break;
-            case CompareOperator::IsNull:
-            case CompareOperator::IsNotNull:
             default:
                 break;
         }
@@ -123,11 +122,21 @@ class DROGON_EXPORT Criteria
              const CompareOperator &opera,
              const std::vector<T> &args)
     {
-        assert(opera == CompareOperator::In && args.size() > 0);
-        conditionString_ = colName + " in (";
-        for (size_t i = 0; i < args.size(); ++i)
+        const auto argsSize = args.size();
+        assert(((opera == CompareOperator::In) ||
+                (opera == CompareOperator::NotIn)) &&
+               (argsSize > 0));
+        if (opera == CompareOperator::In)
         {
-            if (i < args.size() - 1)
+            conditionString_ = colName + " in (";
+        }
+        else if (opera == CompareOperator::NotIn)
+        {
+            conditionString_ = colName + " not in (";
+        }
+        for (size_t i = 0; i < argsSize; ++i)
+        {
+            if (i < (argsSize - 1))
                 conditionString_.append("$?,");
             else
                 conditionString_.append("$?");
@@ -146,11 +155,21 @@ class DROGON_EXPORT Criteria
              const CompareOperator &opera,
              std::vector<T> &&args)
     {
-        assert(opera == CompareOperator::In && args.size() > 0);
-        conditionString_ = colName + " in (";
-        for (size_t i = 0; i < args.size(); ++i)
+        const auto argsSize = args.size();
+        assert(((opera == CompareOperator::In) ||
+                (opera == CompareOperator::NotIn)) &&
+               (argsSize > 0));
+        if (opera == CompareOperator::In)
         {
-            if (i < args.size() - 1)
+            conditionString_ = colName + " in (";
+        }
+        else if (opera == CompareOperator::NotIn)
+        {
+            conditionString_ = colName + " not in (";
+        }
+        for (size_t i = 0; i < argsSize; ++i)
+        {
+            if (i < (argsSize - 1))
                 conditionString_.append("$?,");
             else
                 conditionString_.append("$?");