what are the 12 codd's rule
What are the twelve codd’s rule Codd’s rules are a set of guidelines and principels that define the characteristics that define the characteristics that relational database management system (RDBMS) must meet to be considered a truly rlational database. Here are the 12 Codd’s Rules: Rule 0: The Foundation Rule A relational DBMS must be able to mange its data entirely trough its relational capabilities. Rule 1: Information rule All data in a relational database is to be represented in one and only one way, namely by values in tables. Rule 2: Guaranteed Access Rule Each and every data element (atomic value) is guaranteed to be accessible logically with a combination of table name, primary key value, and column name. Rule 3: systematic Treatment of Null values Null value are treated uniformly and systematically. Rule 4: Dynamic online catalog Based on the Relational model The database schema must be stored in the same relational format as regular data. Ru