Explain the di?erence between the object id in an object database and the primary key of a relation in a relational database.
What will be an ideal response?
In an object database, each object has a unique and immutable identity, called its object id (oid). It which is assigned by the system when the object is created and does not change during the life of that object.
A primary key might change (a person might change her social security number), and it is typically assigned by the programmer, not DBMS.
You might also like to view...
In order to import content from a Word file for slides, the Word file needs to use ________
A) columns B) bolding C) tabs D) heading levels
Current Mac models (iMac models) may come with a Multi-Touch trackpad.
Answer the following statement true (T) or false (F)
Text that is separated by tabs can be converted into a table
Indicate whether the statement is true or false
A ____ form contains one page that displays the Web form and one page that process the form data.
A. two-part B. binary C. double D. dual