Does it seem clear to you that a + b is equivalent to b + a? If you know the semantics of join operations (as you should to at least a basic degree if you're g

Does it seem clear to you that a + b is equivalent to b + a? If you know the semantics of join operations (as you should to at least a basic degree if you're going to use them), the SQL notation above is just as clear as the arithmetic notation for addition.