1. Create and updates tuples with complex types (tuple-valued and set-valued)

insert into doc
values
("salesplan", set("Smith", "Jones"), (1, "April", 89), set("prot", "strategy")

2. We can also use complex values in queries: anywhere in a query where a set is expected, we can enumerate a set.

select name, date
from doc
where name in set ("salesplan", "opportunities", "risks")

3. To create new objects, we can use constructor functions. The constructor function for an object type T isT(); when it is invoked it creates a new uninitialized object of type T, fills in its oid field, and returns the object. The fields of the object must then be initialized.