diff --git a/sql/bcnftdb.sql b/sql/bcnftdb.sql
index 16658e54..eca0939a 100644
--- a/sql/bcnftdb.sql
+++ b/sql/bcnftdb.sql
@@ -50,6 +50,7 @@ CREATE TABLE `t_nft` (
   KEY `idx_net_id_token_type_owner_address_last_owner_address` (`net_id`, `token_type`, `owner_address`, `last_owner_address`),
   KEY `idx_net_id_token_type_token_id` (`net_id`, `token_type`, `token_id`),
   KEY `idx_last_owner_address` (`last_owner_address`),
+  KEY `idx_item_id` (`item_id`),
   KEY `owner_address` (`owner_address`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10001 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 /*!40101 SET character_set_client = @saved_cs_client */;
@@ -216,6 +217,7 @@ CREATE TABLE `t_sale` (
   PRIMARY KEY (`idx`),
   UNIQUE KEY `idx_order_id` (`order_id`),
   KEY `idx_buyer` (`buyer`),
+  KEY `idx_item_id` (`item_id`),
   KEY `idx_seller` (`seller`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10001 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 /*!40101 SET character_set_client = @saved_cs_client */;