Mastery over which subject is NOT required for being a data scientist??

To prevent class objects from being copied or assigned, you can:

a. Declare as private the class’s copy constructor and overloaded assignment operator. b. Declare the class’s copy constructor and overloaded assignment operator with with = delete after the parameter list. c. Simply do not declare a copy constructor or assignment operator in the class. d. (a) or (b).

A SQL join with a WHERE clause is known as a:

a. inner join b. equi-join c. cross join d. left join