Reference Types & Deref.
In most ORDBMS, every object has an OID
So, can “point” to objects -- reference types!
Don’t confuse reference and complex types!
- mytheater row(tno integer, name text, address text, phone integer)
- theater ref(theater_t)
Both look same at output, but are different!!
- deletion, update, “sharing”
- similar to “by value” vs. “by reference” in PL