Witch one shoul i use to combine to two table that have same column names but different ID patients? How to add all the patients and make one table?
Tables->Concatenate is what you need when you have two table with the same columns that you want in one table.
Another question is how to update a table with new data?
It depends on what you mean about updating. If you get another table with the same columns but new rows you can use Tables->Concatenate again. There's an option to Append to the first table. That will update the main table instead of creating a new table.