SELECT TABLE_NAME as table_name FROM information_schema.TABLES WHERE TABLE_NAME LIKE '%iot_history_sensor_data%' ORDER BY TABLE_NAME DESC LIMIT 1 ; SELECT TABLE_NAME as table_name FROM information_schema.TABLES WHERE TABLE_NAME LIKE '%iot_history_sensor_data%' AND table_schema= #{db_name} CREATE TABLE iot_history_sensor_data_${table_index} LIKE iot_history_sensor_data_1; ALTER TABLE iot_history_sensor_data UNION(${table_names}) ; SELECT COUNT(1) as num FROM iot_history_sensor_data_${table_index}