Show that in SQL-92 the use of negation in every query is strati?ed.

What will be an ideal response?


Since SQL-92 has no recursion, whenever a view, V, depends on another relation R (view or base) through negation (NOT or EXCEPT) then the de?nition of R does not depend on V. This implies strati?cation.

Computer Science & Information Technology

You might also like to view...

Which of the following statements is true?

a. The Internet is just a network of computers. b. The internet is now an Internet of Things. c. Each thing in the Internet of things is an object with an IP address. d. Each thing in the Internet of Things must have the ability to send data automatically over a network.

Computer Science & Information Technology

Which STP mode is the default on most modern Cisco Catalyst switches?

A) MST B) RPVST+ C) PVST+ D) CST

Computer Science & Information Technology

In a research paper, a note placed at the bottom of the page.

What will be an ideal response?

Computer Science & Information Technology

A(n) ____ provides you with text formatting and page layout features when creating a new file. 

A. shortcut B. template C. application D. window

Computer Science & Information Technology