calculate.sql

DROP IF EXISTS TABLE [tmp_table_name];
CREATE TABLE [tmp_table_name] engine=innodb (select * from [reference_table] where ...);
SELECT 
  TABLE_NAME AS `Table`,
  ROUND(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`
FROM 
  INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '[schema]' AND TABLE_NAME = '[tmp_table_name]';