SQL + Database Design Pattern Framework

I want to buy SQL + Database Design Pattern Framework

The standard edition cost is $229 and pro edition is $279 

when I clicked on standard edition 1 user order button, I saw the check uprade to Pro edition only $50. That mean I can get two edition with $279, right?

So If I want to buy both standard and pro edition. How much does it cost? 

Hello Thành Luân:

The PRO SQL Framework version includes everything the Standard SQL Framework has. 
So, you only need to buy one version. 

Hope this helps.
Jack