Syntax for primary key tablespace

Indexes should be on different drives than tables, therefore, is there a convenient syntax to do this from the start? create table x (a NUMBER primary key a) tablespace y
will just throw them both in y. Does it have to be separated into a create table and alter statement to separate the default created index?
so that alter x add constraint....using tablespace zz. or something? (That's the way I'm going to do it, just wondered if any other ideas).

• Dc.