i have two tables and i want to create another table that contains both the information in the two alrady established tables, and whenever the previously established tables are altered the table containing data from both tables is automatically updated
If this is what your boss wants at the technical level, find a new job. He's an idiot. (You may show him this and quote me if you decide that you need a new job.) But on the odd chance that he gave you a results requirement rather than a technical requirement,...
Normalization rules would prevent you from doing what you described because they would lead to duplicate data. You would spend the rest of your life trying to maintain a database that no one would love. You would be frustrated as hell. And your database would be bloated beyond belief.
BUT... if you put a prime key in your customer table (perhaps even a simple autonumber field) and a prime key in your distributor table (perhaps another simple autonumber field), your THIRD table only needs to copy the keys of the customer and distributor, not the rest of the data. Updates to either table are available to the third table in potential.
Now, when you USE the third table, use it with JOIN queries back to the customer and/or distributor tables. This way, if an update has occurred in either table, it is there when you call up that data through the JOIN.
Just as a side note, in any table that shows both customers and distributors in the same table, you have the potential for a many-to-many relationship, which would vex you worse than the mutual update issues. You seriously need to learn more about normalization and data relationships because in the situation you describe, you are going to need it.