Oh, they loaded the Etherium blockchain into an SQL database. Easy. From the title, it appeared that someone had figured out how to represent an SQL database in the blockchain using the virtual machine for contracts. That would be hard.
As I've pointed out before, smart contracts need atomic transactions. Either everything commits, or nothing commits. This is a basic property needed for accounting systems.
As I've pointed out before, smart contracts need atomic transactions. Either everything commits, or nothing commits. This is a basic property needed for accounting systems.