How can I sum columns across multiple tables in MySQL?

Question

In MySQL I have two tables:

Table MC:
----------------
|TransNo | Qty |
|--------|-----|
|  xxx1  |  4  | 
|  xxx3  |  3  |

and

<         


        

Answer 1

And what about:

SELECT (SELECT SUM(`Qty`) FROM `MC`) + (SELECT SUM(`Qty`) FROM `Amex`) AS `sumf`;