SET FOREIGN_KEY_CHECKS=0;
-DROP TABLE sdnctl.CONFIG_RESOURCE_ASSIGNMENT_DATA;
-DROP TABLE sdnctl.CONFIG_RESOURCE;
-DROP TABLE sdnctl.CONFIG_RESOURCE_RELATION;
-DROP TABLE sdnctl.CONFIG_TRANSACTION_LOG;
+DROP TABLE IF EXISTS sdnctl.CONFIG_RESOURCE_ASSIGNMENT_DATA;
+DROP TABLE IF EXISTS sdnctl.CONFIG_RESOURCE;
+DROP TABLE IF EXISTS sdnctl.CONFIG_RESOURCE_RELATION;
+DROP TABLE IF EXISTS sdnctl.CONFIG_TRANSACTION_LOG;
SET FOREIGN_KEY_CHECKS=1;