anchor.diff:  CREATE CONSTRAINT ON (movie:Movie) ASSERT movie.title IS UNIQUE
   ----
   
  +////
  +Constraints added: 1
  +////
  +
   // console
   
   Note that adding the unique constraint will add an index on that property, so we won't do that separately.
  
positive.code: ----
  CREATE INDEX ON :Actor(name)
  ----
  
  Indexes can be added at any time.
  Constraints can be added after a label is already in use, but that requires that the existing data complies with the constraints.
  
negative.code: RETURN actor;
  ----
  
  ////
  Tom Hanks
  1 row
  ////
  
  Now let's say we want to add another label for a node.
  Here's how to do that:
  
  