The closed world assumption / C.J. Date.

Format:

Video

Author/Creator:

Date, C. J., on-screen presenter.

Language:

English

Subjects (All):

Logic design--Data processing.

Logic design.

Logic circuits--Data processing.

Logic circuits.

Genre:

Electronic videos.

Physical Description:

1 online resource (1 streaming video file (1 hr., 34 min., 42 sec.)) : digital, sound, color.

Edition:

1st edition

Place of Publication:

[Place of publication not identified] : O'Reilly Media, 2014.

System Details:

video file

Summary:

"The presentation is divided into four modules. Module I lays some important groundwork, discussing predicates and constraints in particular and stressing the importance of database consistency. Module II considers consistency in more detail and then discusses a simple example in depth, building to the conclusion that the OWA and the relational model are fundamentally and irrevocably at odds with each other (which is why in practice we always adopt the CWA). Module III then goes into more depth on predicates and shows how to get "don't know" answers out of the database (when appropriate) without any need for nulls or three-valued logic (3LV). Finally, Module IV shows how the CWA can even be used in connection with predicates involving negation or conjunction."--Resource description page.

Participant:

Presenter, C.J. Date.

Notes:

Title from title screen (viewed December 18, 2014)

Date of publication taken from resource description page.

OCLC:

899594634