Every month, I need to perform a repetitive process, for which I need to verify that all the necessary columns are found in the table of origin. For example, in a table I only need the following columns: Employee, payment and discount, but sometimes the discount column does not come in the source table, so I need to create that column with a value in zero. In short, I need to create a column depending on whether it is not included in my original table. I hope you understand. Thanks a lot.