diff --git a/gears/create_databaase/2.init_database.sql b/gears/create_databaase/2.init_database.sql
index e00d7ef8d7addd745c47594997ae297ac9203cd1..7f46fbb7d09571e8f4972e1beadb4a3479eab666 100644
--- a/gears/create_databaase/2.init_database.sql
+++ b/gears/create_databaase/2.init_database.sql
@@ -314,7 +314,6 @@ UNLOCK TABLES;
 /*!50003 SET @saved_col_connection = @@collation_connection */ ;
 /*!50003 SET character_set_client  = utf8mb4 */ ;
 /*!50003 SET character_set_results = utf8mb4 */ ;
-/*!50003 SET collation_connection  = utf8mb4_0900_ai_ci */ ;
 /*!50003 SET @saved_sql_mode       = @@sql_mode */ ;
 /*!50003 SET sql_mode              = 'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION' */ ;
 DELIMITER ;;
@@ -330,7 +329,6 @@ DELIMITER ;
 /*!50003 SET @saved_col_connection = @@collation_connection */ ;
 /*!50003 SET character_set_client  = utf8mb4 */ ;
 /*!50003 SET character_set_results = utf8mb4 */ ;
-/*!50003 SET collation_connection  = utf8mb4_0900_ai_ci */ ;
 /*!50003 SET @saved_sql_mode       = @@sql_mode */ ;
 /*!50003 SET sql_mode              = 'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION' */ ;
 DELIMITER ;;
@@ -390,7 +388,7 @@ CREATE TABLE `payment` (
   `payment_date` timestamp NULL DEFAULT NULL,
   `day` date GENERATED ALWAYS AS (cast(`payment_date` as date)) STORED,
   PRIMARY KEY (`payment_id`),
-  KEY `idx_payment_date` ((cast(`payment_date` as date)))
+  KEY `idx_payment_date` (payment_date)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
@@ -509,7 +507,6 @@ USE `studio`;
 /*!50001 SET @saved_col_connection     = @@collation_connection */;
 /*!50001 SET character_set_client      = utf8mb4 */;
 /*!50001 SET character_set_results     = utf8mb4 */;
-/*!50001 SET collation_connection      = utf8mb4_0900_ai_ci */;
 /*!50001 CREATE ALGORITHM=UNDEFINED */
 /*!50001 VIEW `v_addresses` AS select `employee`.`name` AS `name`,`employee`.`address` AS `address` from `employee` union select `customer`.`name` AS `name`,`customer`.`address` AS `address` from `customer` */;
 /*!50001 SET character_set_client      = @saved_cs_client */;