Search
×

Sign up

Use your Facebook account for quick registration

OR

Create a Shvoong account from scratch

Already a Member? Sign In!
×

Sign In

Sign in using your Facebook account

OR

Not a Member? Sign up!
×

Sign up

Use your Facebook account for quick registration

OR

Sign In

Sign in using your Facebook account

Shvoong Home>Books>How To & Self Help>Codd's 12 Rules Review

Codd's 12 Rules

Article Review   by:mayurpawargi     Original Author: Edgar F.Codd
ª
 
Codd's 12 rules

Codd's 12 rules are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F. Codd, a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be considered relational, i.e., an RDBMS. [1][2]

Rule 0: The system must qualify as relational, as a database, and as a management system.

Rule 1: The information rule:

Rule 2: The guaranteed access rule:

Rule 3: Systematic treatment of null values:

Rule 4: Active online catalog based on the relational model:

Rule 5: The comprehensive data sublanguage rule:

Rule 6: The view updating rule:

Rule 7: High-level insert, update, and delete:

Rule 8: Physical data independence:

Rule 9: Logical data independence:

Rule 10: Integrity independence:

Rule 11: Distribution independence:

Rule 12: The nonsubversion rule:
Published: October 14, 2008   
Please Rate this Review : 1 2 3 4 5
  1. Answer   Question  :    show in hindi codes rules View All
Translate Send Link Print
X

.