When an object is not null, you can access its members (data members and ... string Address { get; set; } } Now write the following code to create an Author, assign values to the FirstName and ...

Null or nonexistent data gets complicated when the application expects a data value and gets nothing or unexpected values; that's when you must perform coding that properly handles these ...

select ‘true’ from dual where null is null; When you use IN, you’re telling SQL to take a value and compare it against every value or set of values in a list using =. If any NULL values ...