CONSTRAINT What for?

[IlyaJava]

What is the difference between:

FOREIGN KEY (CustomerId)  REFERENCES Customers (Id)

AND:

CONSTRAINT orders_custonmers_fk 
    FOREIGN KEY (CustomerId)  REFERENCES Customers (Id)

[SagarJaybhay]

CONSTRAINT clause allows you to define constraint name for the foreign key constraint. If you omit it, MySQL will generate a name automatically.

FOREIGN KEY clause specifies the columns in the child table that refers to primary key columns in the parent table. You can put a foreign key name after FOREIGN KEY clause or leave it to let MySQL create a name for you.